Security Updates

Security Updates for Drupal with Composer

Use when:

• Running a security audit on a Drupal project
• Fixing packages flagged by composer audit
• Applying a specific security advisory
• Verifying no known vulnerabilities remain

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Before You Start — Create a Branch

> This step is mandatory. Do not run any composer commands until a new branch is created and confirmed. > Never update packages directly on main or master.

Check the current branch first:

git branch --show-current

If the user is on main, master, or any protected branch, stop and ask: "What would you like to name the new branch for these security fixes?"

Suggest a default if they are unsure (e.g., security/drupal-updates-YYYY-MM-DD).

git checkout -b 

Confirm the new branch is active before proceeding:

git branch --show-current

Only continue to the next step once the output confirms a non-protected branch.

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Audit for Vulnerabilities

composer audit

Output lists packages with known advisories, CVE IDs, and links to the advisory.

JSON output (for scripting)

composer audit --format=json

Audit without dev dependencies

composer audit --no-dev

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Fix a Specific Vulnerable Package

composer update drupal/package --with-all-dependencies

Use --with-all-dependencies to allow transitive dependency version changes required by the update.

Example — fix a known advisory in drupal/core

composer update drupal/core-recommended drupal/core-composer-scaffold --with-all-dependencies

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Fix All Packages with Advisories

Update only packages flagged by the audit, staying within the version constraints in composer.json:

composer update --with-all-dependencies $(composer audit --format=json 2>/dev/null \
  | python3 -c "import sys,json; data=json.load(sys.stdin); print(' '.join(set(a['packageName'] for a in data.get('advisories', {}).values() if isinstance(a, dict)) or [v[0]['packageName'] for v in data.get('advisories', {}).values()]))" 2>/dev/null)

Or update them manually after reviewing the audit output:

# List vulnerable packages from audit output, then update each
composer update drupal/package1 drupal/package2 --with-all-dependencies

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Verify No Vulnerabilities Remain

composer audit

Expected output after all fixes:

No security vulnerability advisories found.

> After the audit is clean, always ask the user these questions in order: > > 1. "Do you want to commit these changes?" > - If yes: > ``bash > git add composer.json composer.lock > git commit -m "Apply Drupal security updates" > ` > - If no → remind the user that composer.json and composer.lock` are uncommitted before proceeding. > > 2. "Do you want to deploy these changes to an Acquia environment?" > - If yes → follow the [Drupal Update and Deploy playbook](../../playbooks/drupal-update-deploy/SKILL.md) to push code, switch the environment, and optionally trigger a pipeline build. > - If no → done.

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Troubleshooting

"Your requirements could not be resolved"

The version required to fix the advisory conflicts with another constraint. Options:

# Check what requires the package
composer why drupal/package

# Check what prevents the update
composer why-not drupal/package 2.x

# Relax the constraint in composer.json if safe, then retry
composer update drupal/package --with-all-dependencies

Advisory persists after update

Composer's local advisory database may be stale. Refresh it:

composer audit --update-cache
composer audit

Package cannot be updated without breaking other packages

Pin the conflicting package temporarily and file a follow-up:

# Check the full dependency tree
composer depends drupal/conflicting-package

Resolve the constraint in composer.json before retrying.

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Best Practices

1. Run composer audit before every deploy — catch new advisories early.
2. Use --with-all-dependencies — security fixes often require transitive updates.
3. Review composer.lock diff — confirm only expected packages changed.
4. Check the advisory link — understand what the vulnerability is before updating.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: acquia
• Source: acquia/acquia-skills-private
• License: MIT

Install and usage instructions live in the source repository linked above.