diff --git a/.github/workflows/bump-version.yml b/.github/workflows/bump-version.yml
index ae0e002e3..304cb9663 100644
--- a/.github/workflows/bump-version.yml
+++ b/.github/workflows/bump-version.yml
@@ -6,10 +6,10 @@ on:
       - main
     paths-ignore:
       - .*
-      - .github/*/*.md
-      - .github/*/*.yml
       - .github/*.md
       - .github/*.yml
+      - .github/*/*.md
+      - .github/*/*.yml
       - CHANGELOG.rst
       - CI/*.in
       - CI/*.txt
@@ -56,6 +56,7 @@ jobs:
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           token: ${{ steps.token_generator.outputs.token }}
+          persist-credentials: false
       - name: Set up Python3
         uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
@@ -68,28 +69,23 @@ jobs:
           git_user_signingkey: true
           git_commit_gpgsign: true
           trust_level: 5
-      - name: Current Version
-        run: |
-          CURRENT_VERSION="$(grep -E '__version__'  src/xclim/__init__.py | cut -d ' ' -f3)"
-          echo "current_version=${CURRENT_VERSION}"
-          echo "CURRENT_VERSION=${CURRENT_VERSION}" >> $GITHUB_ENV
       - name: Install CI libraries
         run: |
           python -m pip install --require-hashes -r CI/requirements_ci.txt
       - name: Conditional Bump
         run: |
-          if [[ ${{ env.CURRENT_VERSION }} =~ -dev(\.\d+)? ]]; then
+          CURRENT_VERSION=$(bump-my-version show current_version)
+          if [[ ${CURRENT_VERSION} =~ -dev(\.\d+)? ]]; then
             echo "Development version (ends in 'dev(\.\d+)?'), bumping 'build' version"
             bump-my-version bump build
           else
             echo "Version is stable, bumping 'patch' version"
             bump-my-version bump patch
           fi
-          NEW_VERSION="$(grep -E '__version__'  src/xclim/__init__.py | cut -d ' ' -f3)"
-          echo "new_version=${NEW_VERSION}"
-          echo "NEW_VERSION=${NEW_VERSION}" >> $GITHUB_ENV
+          echo "new_version=$(bump-my-version show current_version)"
       - name: Push Changes
         uses: ad-m/github-push-action@d91a481090679876dfc4178fef17f286781251df # v0.8.0
         with:
           force: false
           branch: ${{ github.ref }}
+          github_token: '${{ token_generator.outputs.token }}'
diff --git a/.github/workflows/cache-cleaner.yml b/.github/workflows/cache-cleaner.yml
index 1dbdde016..ecff143ca 100644
--- a/.github/workflows/cache-cleaner.yml
+++ b/.github/workflows/cache-cleaner.yml
@@ -26,6 +26,8 @@ jobs:
 
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
 
       - name: Cleanup
         run: |
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index ea1e08d16..5278ab1fd 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -5,17 +5,17 @@ on:
     branches:
       - main
     paths-ignore:
+      - .github/*/*.yml
+      - .pre-commit-config.yaml
       - CHANGELOG.rst
       - CI/*.txt
       - Makefile
-      - pyproject.toml
-      - tox.ini
-      - src/xclim/__init__.py
       - docs/*/*.ipynb
       - docs/*/*.py
       - docs/*/*.rst
-      - .github/*/*.yml
-      - .pre-commit-config.yaml
+      - pyproject.toml
+      - src/xclim/__init__.py
+      - tox.ini
   pull_request:
     branches:
       - main
@@ -51,14 +51,20 @@ jobs:
             objects.githubusercontent.com:443
             pypi.org:443
             uploads.github.com:443
+
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
+
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
         uses: github/codeql-action/init@1245696032ecf7d39f87d54daa406e22ddf769a8
         with:
           languages: ${{ matrix.language }}
+
       - name: Autobuild
         uses: github/codeql-action/autobuild@1245696032ecf7d39f87d54daa406e22ddf769a8
+
       - name: Perform CodeQL Analysis
         uses: github/codeql-action/analyze@1245696032ecf7d39f87d54daa406e22ddf769a8
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
index 5134beff1..721dd4bbd 100644
--- a/.github/workflows/dependency-review.yml
+++ b/.github/workflows/dependency-review.yml
@@ -41,6 +41,8 @@ jobs:
 
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
 
       - name: Dependency Review
         uses: actions/dependency-review-action@3b139cfc5fae8b618d3eae3675e383bb1769c019 # v4.5.0
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 2a28cada2..2c19ed8f3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -63,6 +63,8 @@ jobs:
         continue-on-error: true
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
       - name: Set up Python3
         uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
@@ -138,6 +140,8 @@ jobs:
         continue-on-error: true
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
       - name: Set up Python${{ matrix.python-version }}
         uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
@@ -263,6 +267,8 @@ jobs:
         continue-on-error: true
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
       - name: Install Eigen3 (SBCK)
         if: ${{ matrix.python-version == '3.11' && matrix.os == 'ubuntu-latest' }}
         run: |
@@ -367,6 +373,8 @@ jobs:
         continue-on-error: true
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
       - name: Setup Conda (Micromamba) with Python${{ matrix.python-version }}
         uses: mamba-org/setup-micromamba@06375d89d211a1232ef63355742e9e2e564bc7f7 # v2.0.2
         with:
diff --git a/.github/workflows/publish-mastodon.yml b/.github/workflows/publish-mastodon.yml
index b9c0e6a47..e43d18b17 100644
--- a/.github/workflows/publish-mastodon.yml
+++ b/.github/workflows/publish-mastodon.yml
@@ -26,12 +26,14 @@ jobs:
 
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
 
       - name: Get Release Description
         run: |
           # Fetch the release information using the GitHub API
           RELEASE_INFO=$(curl -sH "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
-            "https://api.github.com/repos/${{ github.repository }}/releases/tags/${{ github.event.release.tag_name }}")
+            "https://api.github.com/repos/${{ github.repository }}/releases/tags/${TAG_NAME}")
 
           # Extract the release description from the response
           RELEASE_DESCRIPTION=$(echo "$RELEASE_INFO" | jq -r .body)
@@ -43,6 +45,8 @@ jobs:
           CONTRIBUTORS=$(echo "$CLEANED_DESCRIPTION" | head -n 1)
 
           echo "contributors=${CONTRIBUTORS}" >> $GITHUB_ENV
+        env:
+          TAG_NAME: ${{ github.event.release.tag_name }}
 
       - name: Prepare Message
         id: render_template
@@ -55,7 +59,10 @@ jobs:
 
       - name: Message Preview
         run: |
-          echo "${{ steps.render_template.outputs.result }}${{ env.contributors }}"
+          echo "${TEMPLATE}${CONTRIBUTORS}"
+        env:
+          TEMPLATE: ${{ steps.render_template.outputs.result }}
+          CONTRIBUTORS: ${{ env.contributors }}
 
       - name: Send toot to Mastodon
         uses: cbrgm/mastodon-github-action@50b70e53ab0871a90fe364ff96e783c7e3633f15 # v2.1.11
diff --git a/.github/workflows/publish-pypi.yml b/.github/workflows/publish-pypi.yml
index aec9b5786..07b6dbafa 100644
--- a/.github/workflows/publish-pypi.yml
+++ b/.github/workflows/publish-pypi.yml
@@ -30,6 +30,8 @@ jobs:
             upload.pypi.org:443
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
       - name: Set up Python3
         uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
diff --git a/.github/workflows/scorecard.yml b/.github/workflows/scorecard.yml
index 40d3a222b..fc54179ce 100644
--- a/.github/workflows/scorecard.yml
+++ b/.github/workflows/scorecard.yml
@@ -16,7 +16,9 @@ on:
       - main
 
 # Declare default permissions as read only.
-permissions: read-all
+# Read-all permission is not technically needed for this workflow.
+permissions:
+  contents: read
 
 jobs:
   analysis:
diff --git a/.github/workflows/tag-testpypi.yml b/.github/workflows/tag-testpypi.yml
index 56d74a0f3..03b43dd57 100644
--- a/.github/workflows/tag-testpypi.yml
+++ b/.github/workflows/tag-testpypi.yml
@@ -30,6 +30,8 @@ jobs:
             test.pypi.org:443
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
       - name: Set up Python3
         uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b # v5.3.0
         with:
diff --git a/.github/workflows/testdata-version.yml b/.github/workflows/testdata-version.yml
index 8a54d058a..5f7754517 100644
--- a/.github/workflows/testdata-version.yml
+++ b/.github/workflows/testdata-version.yml
@@ -31,6 +31,8 @@ jobs:
             github.com:443
       - name: Checkout Repository
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
       - name: Find xclim-testdata Tag and CI Testing Branch
         run: |
           XCLIM_TESTDATA_TAG="$( \
@@ -43,8 +45,11 @@ jobs:
           echo "XCLIM_TESTDATA_BRANCH=${XCLIM_TESTDATA_BRANCH}" >> $GITHUB_ENV
       - name: Report Versions Found
         run: |
-          echo "Latest xclim-testdata tag: ${{ env.XCLIM_TESTDATA_TAG }}"
-          echo "Tag for xclim-testdata in CI: ${{ env.XCLIM_TESTDATA_BRANCH }}"
+          echo "Latest xclim-testdata tag: ${XCLIM_TESTDATA_TAG}"
+          echo "Tag for xclim-testdata in CI: ${XCLIM_TESTDATA_BRANCH}"
+        env:
+          XCLIM_TESTDATA_TAG: ${{ env.XCLIM_TESTDATA_TAG }}
+          XCLIM_TESTDATA_BRANCH: ${{ env.XCLIM_TESTDATA_BRANCH }}
       - name: Find Comment
         uses: peter-evans/find-comment@3eae4d37986fb5a8592848f6a574fdf654e61f9e # v3.1.0
         id: fc
diff --git a/.github/workflows/upstream.yml b/.github/workflows/upstream.yml
index e33e8a7ff..fe446be9b 100644
--- a/.github/workflows/upstream.yml
+++ b/.github/workflows/upstream.yml
@@ -69,6 +69,7 @@ jobs:
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           fetch-depth: 0 # Fetch all history for all branches and tags.
+          persist-credentials: false
       - name: Setup Conda (Micromamba) with Python${{ matrix.python-version }}
         uses: mamba-org/setup-micromamba@06375d89d211a1232ef63355742e9e2e564bc7f7 # v2.0.2
         with:
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 5276ccfa8..be96192b6 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -40,6 +40,9 @@ Internal changes
 CI changes
 ^^^^^^^^^^
 * Added the `green-coding-solutions/eco-ci-energy-estimation` GitHub Action to the workflows to establish energy and carbon usage of CI activity. (:pull:`1863`).
+* Various workflow security fixes: (:pull:`2023`)
+    * Simplified the `bump-version.yml` version string parsing to harden against template injection.
+    * Further de-escalated privileges for most workflows.
 
 New features and enhancements
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^