CVE-2026-87937 Central Authentication System (CAS) Server - Moderately critical - Open redirect - SA-CONTRIB-2026-135
Medium 6.5
Published
Updated
Check this codebase for CVE-2026-87937 and fix it if it is affected.
What it is: CVE-2026-87937 is a medium-severity vulnerability in Drupal Central Authentication System (CAS) Server, published on 22 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-87937 in the wild and no public exploit code.
Affected product: Drupal Central Authentication System (CAS) Server. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-87937/ (Markdown: https://insights.sbomify.com/CVE-2026-87937/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-87937?
CVE-2026-87937 is a medium-severity vulnerability in Drupal Central Authentication System (CAS) Server, published on 22 Oct 2026.
Official description
URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Drupal Central Authentication System (CAS) Server allows Fake the Source of Data. This issue affects Central Authentication System (CAS) Server versions: from 0.0.0 to 2.0.4, from 2.1.0 to 2.1.3.
Weakness: CWE-601
Which versions are affected by CVE-2026-87937?
Linux distribution packages (1)
drupal/cas_server Packagist:https://packages.drupal.org/8 | All versions | 2.0.4, 2.1.3 |
How do I fix CVE-2026-87937?
Upgrade to a fixed version.
Is CVE-2026-87937 being exploited?
There is no known exploitation of CVE-2026-87937 in the wild and no public exploit code.
Sources
Also known as DRUPAL-CONTRIB-2026-135, GHSA-9m9j-x6cp-vc3f.