CVE-2026-45143 Chamilo LMS: Student-to-admin stored XSS in private messages via v-html
Authenticated students can inject malicious scripts into private messages, leading to administrator account takeover when the admin views the message.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-45143?
CVE-2026-45143 is a critical cross-site scripting vulnerability in chamilo-lms, published on 17 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Chamilo LMS is an open-source learning management system. From 2.0.0 through at least 2.1.0, Chamilo LMS stores private Message.content without server-side sanitization and renders it as HTML in assets/vue/views/message/MessageShow.vue and public/main/template/default/message/view_message.html.twig. An authenticated low-privilege user, including a student, can directly address crafted message content to an administrator because the message creation flow permits a sender to select another user as the recipient. The content executes in the recipient's browser when the recipient opens the routine inbox or message view, without requiring a link click, and can expose session credentials or permit actions as the administrator. This vulnerability is fixed in 2.0.1.
Weakness: CWE-79
Which versions are affected by CVE-2026-45143?
How do I fix CVE-2026-45143?
No fix has been published for CVE-2026-45143 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-2026-45143 being exploited?
There is no known exploitation of CVE-2026-45143 in the wild and no public exploit code.
Sources
Also known as GHSA-x88v-rg6r-vqq6.