# CVE-2026-1554: Central Authentication System (CAS) Server - Less critical - XML Element Injection - SA-CONTRIB-2026-007

> An XML injection vulnerability in the Drupal CAS Server module allows attackers to escalate privileges.

- **Severity:** Medium 4.2 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 4 Feb 2026
- **Updated:** 5 Feb 2026
- **Also known as:** DRUPAL-CONTRIB-2026-007, GHSA-rgcm-m74w-vrfx

## What is CVE-2026-1554?

CVE-2026-1554 is a medium-severity vulnerability in Drupal Central Authentication System (CAS) Server, published on 4 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

XML Injection (aka Blind XPath Injection) vulnerability in Drupal Central Authentication System (CAS) Server allows Privilege Escalation.This issue affects Central Authentication System (CAS) Server: from 0.0.0 before 2.0.3, from 2.1.0 before 2.1.2.

Weakness: CWE-91 (XML Injection)

## Which versions are affected by CVE-2026-1554?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `drupal/cas_server` | Packagist:https://packages.drupal.org/8 | All versions | 2.0.3, 2.1.2 |

Products: Jtenman Central Authentication System Server.

## How do I fix CVE-2026-1554?

Upgrade to a fixed version.

## Is CVE-2026-1554 being exploited?

There is no known exploitation of CVE-2026-1554 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1554 and fix it if it is affected.

What it is: CVE-2026-1554 is a medium-severity vulnerability in Drupal Central Authentication System (CAS) Server, published on 4 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-1554 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-2026-1554/ (Markdown: https://insights.sbomify.com/CVE-2026-1554/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1554
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1554
- OSV: https://osv.dev/vulnerability/CVE-2026-1554

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1554/
Summaries are generated and may contain mistakes; the official description above is the record.