PatchTheCVECVE-2026-34161: Chamilo LMS is an open-source learning management system
CVE-2026-34161 is a medium-severity flaw (CVSS 5.4) affecting chamilo lms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, a Stored Cross-Site Scripting (XSS) vulnerability exists in the social post attachment upload functionality, where an authenticated user can upload a malicious HTML file containing JavaScript via the /api/social_post_attachments endpoint. The uploaded file is served back from the application at the generated contentUrl without sanitization, content type res
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.4 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | Required |
| EPSS exploit chance | 0.2% (top 88%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2026-04-14 |
| Last modified | 2026-07-24 |
Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-34161?
chamilo lms: upgrade to newer than 1.11.38. Exact commands for each OS are on this page.
Is CVE-2026-34161 being exploited?
CVE-2026-34161 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-34161 affect?
CVE-2026-34161 affects chamilo lms. Severity is medium (CVSS 5.4). Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, a Stored Cross-Site Scripting (XSS) vulnerability exists in the social post attachment upload functionality, where an authenticated user can upload a
How urgent is CVE-2026-34161?
Priority 22/100. No elevated risk signals yet.
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