CVE-2026-82535 Chamilo LMS Stored XSS via Survey Answer Submission in reporting.php
Unauthenticated attackers can inject scripts into survey answers, leading to arbitrary code execution and account takeover in Chamilo LMS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-82535?
CVE-2026-82535 is a medium-severity cross-site scripting vulnerability in chamilo-lms, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Chamilo LMS before 1.11.42 and 3.0.0 contains a stored cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious script payloads into survey answers by computing deterministic invitation codes and bypassing authorization checks in the survey submission endpoint. Attackers can submit crafted answers containing unescaped HTML rendered in reporting views to execute arbitrary scripts in the browser sessions of teachers or administrators, enabling persistent backdoor account creation by exploiting the victim's authenticated session.
Weakness: CWE-79
Which versions are affected by CVE-2026-82535?
How do I fix CVE-2026-82535?
No fix has been published for CVE-2026-82535 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-82535 being exploited?
There is no known exploitation of CVE-2026-82535 in the wild and no public exploit code.
Sources
Also known as GHSA-m3wr-p8wj-jmf6, GHSA-xf2f-2vj2-6hfr.