DrupalCMS
CVE-2024-55637
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedDeserialization of Untrusted Data vulnerability in Drupal Core allows Object Injection.This issue affects Drupal Core: from 8.0.0 before 10.2.11, from 10.3.0 before 10.3.9, from 11.0.0 before 11.0.8. Drupal core contains a chain of methods that is exploitable when an insecure deserialization vulnerability exists on the site. This so-called gadget chain presents no direct threat but is a vector that can be used to achieve remote code execution if the application deserializes untrusted data due to another vulnerability.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceDrupal Core contains a PHP object injection gadget chain that becomes exploitable for remote code execution when any other insecure deserialization vulnerability exists on the site. This is not a direct deserialization flaw but a malicious method chain that amplifies the impact of other deserialization vulnerabilities to achieve RCE.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
DrupalCMS
>= 8.0.0, < 10.2.11>= 10.3.0, < 10.3.9>= 11.0.0, < 11.0.8CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Drupal Core versionRun `drush status` or `grep 'VERSION' web/core/lib/Drupal.php` or inspect CHANGELOG.md in the Drupal root directoryAffected if The installed version falls within the affected ranges: < 10.2.11, >= 10.3.0 and < 10.3.9, or >= 11.0.0 and < 11.0.8
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Identify deserialization entry pointsSearch the codebase for uses of `unserialize()` function: `grep -r "unserialize" web/modules/ web/themes/ web/profiles/` and review any custom or contributed modules accepting serialized input from user sourcesAffected if Any custom or contributed code uses `unserialize()` on data from user input, API endpoints, or external sources without a strict allowed_classes whitelist
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Review form and request parameter handlingInspect custom modules for form submissions or request handlers that may process PHP serialized data: examine `_submit` handlers and `Request` object parameter handling for `serialize()` or `unserialize()` callsAffected if Forms or request handlers accept and deserialize data from query parameters, POST body, or headers without validation
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Check external integrations for deserializationAudit third-party module integrations, REST APIs, and services that might accept serialized objects: review module README files and API endpoints for object deserialization patternsAffected if Any external integration or API endpoint accepts serialized PHP objects from untrusted sources
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Examine database-driven object hydrationReview any custom code that retrieves data from the database and passes it to `unserialize()`: search for `unserialize($row['field'])` patterns in custom modulesAffected if Custom code deserializes data stored in database fields that could be tampered with by attackers
You are affected if your Drupal Core version is within the affected ranges AND any other insecure deserialization vulnerability exists in custom code, contributed modules, or external integrations that could chain with the gadget chain.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped10.2.1110.3.911.0.8
Upgrade Drupal Core to version 10.2.11, 10.3.9, or 11.0.8 or later. Additionally, audit the application for other insecure deserialization entry points since this gadget chain requires an existing deserialization vulnerability to be exploitable.
Drupal 10.3.9 (or 10.2.11 for 10.2.x sites, or 11.0.8 for 11.x sites)
- Identify your current Drupal Core version by checking the VERSION constant in core/lib/Drupal.php or using the administrative UI at /admin/reports/status
- Determine which version branch you are on (10.2.x, 10.3.x, or 11.x)
- Backup your entire Drupal installation including database before proceeding
- Run composer require drupal/core:^10.3.9 --no-interaction --prefer-dist (for sites on 10.3.x branch) OR composer require drupal/core:^10.2.11 --no-interaction --prefer-dist (for sites on 10.2.x branch) OR composer require drupal/core:^11.0.8 --no-interaction --prefer-dist (for sites on 11.x branch)
- Run composer update drupal/core --with-all-dependencies to update dependencies
- Clear Drupal cache using drush cr or php core/scripts/drupal quick-cache-clear
- Verify the upgrade was successful by checking the version at /admin/reports/status
- Ensure no other Drupal contributed modules are still on vulnerable versions
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Drupal
Scoped from the published advisory
- Consultation3.0 h
- Implementation2.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,840.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-55637 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-55637 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data