diff --git a/.github/workflows/call-contributor-pr-reply.yml b/.github/workflows/call-contributor-pr-reply.yml
index 48a3a6576e1..57f0a8ec85d 100644
--- a/.github/workflows/call-contributor-pr-reply.yml
+++ b/.github/workflows/call-contributor-pr-reply.yml
@@ -1,5 +1,5 @@
 name: Send reply on a new contributor pull request
-on:
+on: # zizmor: ignore[dangerous-triggers]
   pull_request_target:
     types: [opened]
 permissions:
diff --git a/.github/workflows/call-pull-request-target.yml b/.github/workflows/call-pull-request-target.yml
index 142acc40eea..7ff98ae712e 100644
--- a/.github/workflows/call-pull-request-target.yml
+++ b/.github/workflows/call-pull-request-target.yml
@@ -1,5 +1,5 @@
 name: Handle pull request events
-on:
+on: # zizmor: ignore[dangerous-triggers]
   pull_request_target:
     types: [opened, review_requested, labeled]
 permissions:
diff --git a/.github/workflows/call-update-pr-spreadsheet.yml b/.github/workflows/call-update-pr-spreadsheet.yml
index 91965a0b98b..d6a11192e31 100644
--- a/.github/workflows/call-update-pr-spreadsheet.yml
+++ b/.github/workflows/call-update-pr-spreadsheet.yml
@@ -1,5 +1,5 @@
 name: Update community pull requests spreadsheet
-on:
+on: # zizmor: ignore[dangerous-triggers]
   pull_request_target:
     types: [assigned, unassigned, opened, closed, reopened, edited, review_requested, review_request_removed]
 permissions:
diff --git a/.github/workflows/container_image_publish.yml b/.github/workflows/container_image_publish.yml
index 469030d7544..ad101fbb8cc 100644
--- a/.github/workflows/container_image_publish.yml
+++ b/.github/workflows/container_image_publish.yml
@@ -28,8 +28,10 @@ jobs:
     steps:
       - name: Parse Kolibri version
         id: parse-version
+        env:
+          RELEASE_TAG: ${{ inputs.release-tag }}
         run: |
-          tag='${{ inputs.release-tag }}'
+          tag="$RELEASE_TAG"
           echo "kolibri_version=${tag#v}" >> "$GITHUB_OUTPUT"
       - name: Checkout repository
         uses: actions/checkout@v7.0.1
diff --git a/.github/workflows/dependency_updates.yml b/.github/workflows/dependency_updates.yml
index 800b31ad1a8..0628c193bb8 100644
--- a/.github/workflows/dependency_updates.yml
+++ b/.github/workflows/dependency_updates.yml
@@ -86,6 +86,8 @@ jobs:
         with:
           app-id: ${{ secrets.LE_BOT_APP_ID }}
           private-key: ${{ secrets.LE_BOT_PRIVATE_KEY }}
+          permission-contents: write
+          permission-pull-requests: write
       - name: Create Pull Request
         if: steps.check-commit.outputs.changed == 'true' && steps.check-build-changes.outputs.has_build_changes == 'true'
         uses: peter-evans/create-pull-request@v8
@@ -156,6 +158,11 @@ jobs:
         with:
           app-id: ${{ secrets.LE_BOT_APP_ID }}
           private-key: ${{ secrets.LE_BOT_PRIVATE_KEY }}
+          permission-contents: write
+          permission-pull-requests: write
+          # Pushing a change to .github/workflows/, which the prek run above can
+          # produce, needs the app installation's Workflows permission.
+          permission-workflows: write
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v8
         with:
diff --git a/.github/workflows/i18n-download.yml b/.github/workflows/i18n-download.yml
index d56f4be30bd..46206cccaa5 100644
--- a/.github/workflows/i18n-download.yml
+++ b/.github/workflows/i18n-download.yml
@@ -55,6 +55,8 @@ jobs:
         with:
           app-id: ${{ secrets.LE_BOT_APP_ID }}
           private-key: ${{ secrets.LE_BOT_PRIVATE_KEY }}
+          permission-contents: write
+          permission-pull-requests: write
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v8
         with:
diff --git a/.github/workflows/npm_publish.yml b/.github/workflows/npm_publish.yml
index 5e8dd14b5ab..4fc3162d979 100644
--- a/.github/workflows/npm_publish.yml
+++ b/.github/workflows/npm_publish.yml
@@ -60,9 +60,11 @@ jobs:
         run: pnpm install --ignore-scripts --no-optional
       - name: Publish to npm
         id: publish
+        env:
+          NPM_PACKAGE: ${{ github.event.inputs.npm_package }}
         run: |
-          if [ "${{ github.event_name }}" = "workflow_dispatch" ] && [ "${{ github.event.inputs.npm_package }}" != "all" ]; then
-            ./scripts/npm_publish.sh "${{ github.event.inputs.npm_package }}"
+          if [ "$GITHUB_EVENT_NAME" = "workflow_dispatch" ] && [ "$NPM_PACKAGE" != "all" ]; then
+            ./scripts/npm_publish.sh "$NPM_PACKAGE"
           else
             ./scripts/npm_publish.sh
           fi
diff --git a/.github/workflows/npm_version_comment.yml b/.github/workflows/npm_version_comment.yml
index b30a0cabe92..163c1f1d6e4 100644
--- a/.github/workflows/npm_version_comment.yml
+++ b/.github/workflows/npm_version_comment.yml
@@ -1,5 +1,7 @@
 name: npm Package Version Comment
-on:
+# On workflow_run, GITHUB_SHA is the default branch tip, so the checkout below
+# gets base-repository code rather than the PR head.
+on: # zizmor: ignore[dangerous-triggers]
   workflow_run:
     workflows: [npm Package Version Check]
     types:
diff --git a/.github/workflows/platform-android-release_apk.yml b/.github/workflows/platform-android-release_apk.yml
index d93318dc3c7..f9eb93784d7 100644
--- a/.github/workflows/platform-android-release_apk.yml
+++ b/.github/workflows/platform-android-release_apk.yml
@@ -36,4 +36,6 @@ jobs:
         working-directory: ${{ github.workspace }}
         run: uv sync --package kolibri-installer-android --extra build
       - name: Release APK
-        run: uv run python scripts/play_store_api.py release "${{ inputs.version-code }}"
+        env:
+          VERSION_CODE: ${{ inputs.version-code }}
+        run: uv run python scripts/play_store_api.py release "$VERSION_CODE"
diff --git a/.github/workflows/platform-macos-app-build_dmg.yml b/.github/workflows/platform-macos-app-build_dmg.yml
index c7997a01695..c0b810860e0 100644
--- a/.github/workflows/platform-macos-app-build_dmg.yml
+++ b/.github/workflows/platform-macos-app-build_dmg.yml
@@ -82,7 +82,9 @@ jobs:
         run: make dependencies
       - name: Download the whlfile from URL and install
         if: ${{ inputs.whl-url }}
-        run: make get-whl whl=${{ inputs.whl-url }}
+        env:
+          WHL_URL: ${{ inputs.whl-url }}
+        run: make get-whl whl="$WHL_URL"
       - name: Download the whlfile from artifacts
         if: ${{ inputs.whl-file-name }}
         uses: actions/download-artifact@v8
@@ -91,7 +93,9 @@ jobs:
           path: platforms/desktop-app/whl
       - name: Install WHL file from artifacts
         if: ${{ inputs.whl-file-name }}
-        run: make install-whl whl=whl/${{ inputs.whl-file-name }}
+        env:
+          WHL_FILE_NAME: ${{ inputs.whl-file-name }}
+        run: make install-whl whl="whl/$WHL_FILE_NAME"
       - name: Setup app signing certificate
         if: ${{ inputs.release }}
         run: |
diff --git a/.github/workflows/platform-pi-build_img.yml b/.github/workflows/platform-pi-build_img.yml
index 9b38ca0610c..1865095f44d 100644
--- a/.github/workflows/platform-pi-build_img.yml
+++ b/.github/workflows/platform-pi-build_img.yml
@@ -42,7 +42,9 @@ jobs:
       - name: Download the debfile from URL and install
         if: ${{ inputs.deb-url }}
         working-directory: platforms/raspberry-pi
-        run: make get-deb deb=${{ inputs.deb-url }}
+        env:
+          DEB_URL: ${{ inputs.deb-url }}
+        run: make get-deb deb="$DEB_URL"
       - name: Download the debfile from artifacts
         if: ${{ inputs.deb-file-name }}
         uses: actions/download-artifact@v8
diff --git a/.github/workflows/platform-windows-app-build_exe.yml b/.github/workflows/platform-windows-app-build_exe.yml
index 9a6b56eb1c6..dc50298f5fa 100644
--- a/.github/workflows/platform-windows-app-build_exe.yml
+++ b/.github/workflows/platform-windows-app-build_exe.yml
@@ -75,7 +75,10 @@ jobs:
         run: choco install wget --no-progress && choco install innosetup --version=6.6.1 --allow-downgrade --no-progress
       - name: Download and install the whl from URL
         if: ${{ inputs.whl-url }}
-        run: make get-whl whl=${{ inputs.whl-url }}
+        shell: pwsh
+        env:
+          WHL_URL: ${{ inputs.whl-url }}
+        run: make get-whl "whl=$env:WHL_URL"
       - name: Download the whl from artifacts
         if: ${{ inputs.whl-file-name }}
         uses: actions/download-artifact@v8
@@ -84,7 +87,10 @@ jobs:
           path: platforms/desktop-app/whl
       - name: Install whl from artifacts
         if: ${{ inputs.whl-file-name }}
-        run: make install-whl whl=whl/${{ inputs.whl-file-name }}
+        shell: pwsh
+        env:
+          WHL_FILE_NAME: ${{ inputs.whl-file-name }}
+        run: make install-whl "whl=whl/$env:WHL_FILE_NAME"
       - name: Build the application with PyInstaller
         run: make pyinstaller
       - name: Build the Windows installer
diff --git a/.github/workflows/pr_build_comment.yml b/.github/workflows/pr_build_comment.yml
index 68f6494e0a5..ae8e49b7f77 100644
--- a/.github/workflows/pr_build_comment.yml
+++ b/.github/workflows/pr_build_comment.yml
@@ -1,5 +1,7 @@
 name: Build Asset Comment for Pull Request
-on:
+# On workflow_run, GITHUB_SHA is the default branch tip, so the checkout below
+# gets base-repository code rather than the PR head.
+on: # zizmor: ignore[dangerous-triggers]
   workflow_run:
     workflows: [Kolibri Build Assets for Pull Request]
     types:
diff --git a/.github/workflows/pr_labels.yml b/.github/workflows/pr_labels.yml
index 3f8e67ee95a..3e680fd907e 100644
--- a/.github/workflows/pr_labels.yml
+++ b/.github/workflows/pr_labels.yml
@@ -1,12 +1,14 @@
 name: PR Labels
-on: [pull_request_target]
+on: [pull_request_target] # zizmor: ignore[dangerous-triggers]
 permissions:
   contents: read
-  pull-requests: write
 jobs:
   size-labels:
     runs-on: ubuntu-latest
     name: Label the PR size
+    permissions:
+      contents: read
+      pull-requests: write
     steps:
       - uses: codelytv/pr-size-labeler@v1
         with:
diff --git a/.github/workflows/pypi_packages_publish.yml b/.github/workflows/pypi_packages_publish.yml
index bdda1550b24..bd8a330f375 100644
--- a/.github/workflows/pypi_packages_publish.yml
+++ b/.github/workflows/pypi_packages_publish.yml
@@ -62,9 +62,11 @@ jobs:
         run: pnpm install --frozen-lockfile
       - name: Publish
         id: publish
+        env:
+          PYPI_PACKAGE: ${{ github.event.inputs.pypi_package }}
         run: |
-          if [ "${{ github.event_name }}" = "workflow_dispatch" ] && [ "${{ github.event.inputs.pypi_package }}" != "all" ]; then
-            ./scripts/pypi_publish.sh "${{ github.event.inputs.pypi_package }}"
+          if [ "$GITHUB_EVENT_NAME" = "workflow_dispatch" ] && [ "$PYPI_PACKAGE" != "all" ]; then
+            ./scripts/pypi_publish.sh "$PYPI_PACKAGE"
           else
             ./scripts/pypi_publish.sh
           fi
diff --git a/.github/workflows/release_kolibri.yml b/.github/workflows/release_kolibri.yml
index 6062b9736ce..3d30b1e8082 100644
--- a/.github/workflows/release_kolibri.yml
+++ b/.github/workflows/release_kolibri.yml
@@ -3,8 +3,7 @@ on:
   release:
     types: [published]
 permissions:
-  contents: write
-  packages: write
+  contents: read
 jobs:
   latest_release:
     name: Check if this release is the latest release
@@ -15,6 +14,8 @@ jobs:
       - name: Check if the current release is the latest Kolibri release
         id: is_latest_release
         uses: actions/github-script@v9
+        env:
+          RELEASE_TAG_NAME: ${{ github.event.release.tag_name }}
         with:
           result-encoding: string
           script: |
@@ -23,19 +24,23 @@ jobs:
               repo: 'kolibri',
             });
 
-            return latestRelease.tag_name === '${{ github.event.release.tag_name }}';
+            return latestRelease.tag_name === process.env.RELEASE_TAG_NAME;
   whl:
     name: Build WHL file
     uses: ./.github/workflows/build_whl.yml
   upload_whl:
     uses: ./.github/workflows/upload_github_release_asset.yml
     needs: whl
+    permissions:
+      contents: write
     with:
       filename: ${{ needs.whl.outputs.whl-file-name }}
       release_id: ${{ github.event.release.id }}
   upload_tar:
     uses: ./.github/workflows/upload_github_release_asset.yml
     needs: whl
+    permissions:
+      contents: write
     with:
       filename: ${{ needs.whl.outputs.tar-file-name }}
       release_id: ${{ github.event.release.id }}
@@ -48,6 +53,8 @@ jobs:
   upload_pex:
     uses: ./.github/workflows/upload_github_release_asset.yml
     needs: pex
+    permissions:
+      contents: write
     with:
       filename: ${{ needs.pex.outputs.pex-file-name }}
       release_id: ${{ github.event.release.id }}
@@ -68,6 +75,8 @@ jobs:
   upload_dmg:
     uses: ./.github/workflows/upload_github_release_asset.yml
     needs: dmg
+    permissions:
+      contents: write
     with:
       filename: ${{ needs.dmg.outputs.dmg-file-name }}
       release_id: ${{ github.event.release.id }}
@@ -81,6 +90,8 @@ jobs:
   upload_deb:
     uses: ./.github/workflows/upload_github_release_asset.yml
     needs: deb
+    permissions:
+      contents: write
     with:
       filename: ${{ needs.deb.outputs.deb-file-name }}
       release_id: ${{ github.event.release.id }}
@@ -101,6 +112,8 @@ jobs:
   upload_exe:
     uses: ./.github/workflows/upload_github_release_asset.yml
     needs: exe
+    permissions:
+      contents: write
     with:
       filename: ${{ needs.exe.outputs.exe-file-name }}
       release_id: ${{ github.event.release.id }}
@@ -114,6 +127,8 @@ jobs:
   upload_zip:
     uses: ./.github/workflows/upload_github_release_asset.yml
     needs: zip
+    permissions:
+      contents: write
     with:
       filename: ${{ needs.zip.outputs.zip-file-name }}
       release_id: ${{ github.event.release.id }}
@@ -132,6 +147,8 @@ jobs:
   upload_apk:
     uses: ./.github/workflows/upload_github_release_asset.yml
     needs: apk
+    permissions:
+      contents: write
     with:
       filename: ${{ needs.apk.outputs.apk-file-name }}
       release_id: ${{ github.event.release.id }}
diff --git a/.github/workflows/codeql.yml b/.github/workflows/security_scan.yml
similarity index 77%
rename from .github/workflows/codeql.yml
rename to .github/workflows/security_scan.yml
index d59ba3b9340..2e3d704599a 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/security_scan.yml
@@ -1,15 +1,4 @@
-# For most projects, this workflow file will not need changing; you simply need
-# to commit it to your repository.
-#
-# You may wish to alter this file to override the set of languages analyzed,
-# or to provide custom queries or build logic.
-#
-# ******** NOTE ********
-# We have attempted to detect the languages in your repository. Please check
-# the `language` matrix defined below to confirm you have the correct set of
-# supported CodeQL languages.
-#
-name: "CodeQL Advanced"
+name: Security Scan
 on:
   push:
     branches: ["develop", "release-v*"]
@@ -21,16 +10,18 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 permissions:
-  # required for all workflows
-  security-events: write
-  # required to fetch internal or private CodeQL packs
-  packages: read
-  # only required for workflows in private repositories
-  actions: read
   contents: read
 jobs:
   analyze:
     name: Analyze (${{ matrix.language }})
+    permissions:
+      # required for all workflows
+      security-events: write
+      # required to fetch internal or private CodeQL packs
+      packages: read
+      # only required for workflows in private repositories
+      actions: read
+      contents: read
     # Runner size impacts CodeQL analysis time. To learn more, please see:
     #   - https://gh.io/recommended-hardware-resources-for-running-codeql
     #   - https://gh.io/supported-runners-and-hardware-resources
@@ -74,3 +65,20 @@ jobs:
         uses: github/codeql-action/analyze@v4.37.3
         with:
           category: "/language:${{matrix.language}}"
+  # Five zizmor audits need a GitHub API token and so cannot run in the prek
+  # hook. One of them, known-vulnerable-actions, reads the GitHub Advisories
+  # database, so this job's findings change without the tree changing.
+  zizmor:
+    name: Audit workflows with zizmor
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v7.0.1
+        with:
+          persist-credentials: false
+      - uses: zizmorcore/zizmor-action@v0.6.2
+        with:
+          min-confidence: medium
diff --git a/.github/workflows/update_contributors.yml b/.github/workflows/update_contributors.yml
index ed9a7989ef0..cf9c91ceff9 100644
--- a/.github/workflows/update_contributors.yml
+++ b/.github/workflows/update_contributors.yml
@@ -22,6 +22,8 @@ jobs:
         with:
           app-id: ${{ secrets.LE_BOT_APP_ID }}
           private-key: ${{ secrets.LE_BOT_PRIVATE_KEY }}
+          permission-contents: write
+          permission-pull-requests: write
       - uses: peter-evans/create-pull-request@v8
         with:
           token: ${{ steps.token.outputs.token }}
diff --git a/.github/workflows/upload_github_release_asset.yml b/.github/workflows/upload_github_release_asset.yml
index 34c3016a4aa..6b8fae1b360 100644
--- a/.github/workflows/upload_github_release_asset.yml
+++ b/.github/workflows/upload_github_release_asset.yml
@@ -22,7 +22,10 @@ jobs:
           name: ${{ inputs.filename }}
           path: dist
       - uses: actions/github-script@v9
+        env:
+          ASSET_FILENAME: ${{ inputs.filename }}
+          RELEASE_ID: ${{ inputs.release_id }}
         with:
           script: |
             const utils = require('./.github/githubUtils.js')
-            await utils.uploadReleaseAsset(github, context, 'dist/${{ inputs.filename }}', '${{ inputs.release_id }}')
+            await utils.uploadReleaseAsset(github, context, `dist/${process.env.ASSET_FILENAME}`, process.env.RELEASE_ID)
diff --git a/.github/zizmor.yml b/.github/zizmor.yml
new file mode 100644
index 00000000000..31c988992af
--- /dev/null
+++ b/.github/zizmor.yml
@@ -0,0 +1,8 @@
+rules:
+  unpinned-uses:
+    config:
+      policies:
+        '*': ref-pin
+# `--min-confidence medium`, passed by both callers, defers 92 findings as of
+# this commit: 54 artipacked, 20 cache-poisoning, 18 informational
+# template-injection.
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 63f0ba23b12..f29e426e08f 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -31,6 +31,11 @@ repos:
     rev: v1.7.12
     hooks:
       - id: actionlint
+  - repo: https://github.com/zizmorcore/zizmor-pre-commit
+    rev: v1.29.0
+    hooks:
+      - id: zizmor
+        args: [--no-progress, --offline, --min-confidence, medium]
   - repo: https://github.com/astral-sh/ruff-pre-commit
     rev: v0.16.1
     hooks: