CVE-2026-16809 LimeSurvey Community Edition 7.0.5 - Stored XSS in quota message rendering
An authenticated user can inject malicious JavaScript into survey quota messages, leading to stored XSS attacks against other users.
- 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-2026-16809?
CVE-2026-16809 is a high-severity cross-site scripting vulnerability in LimeSurvey, published on 26 Aug 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
LimeSurvey Community Edition 7.0.5 contains a stored cross-site scripting vulnerability in the survey quota creation workflow. An authenticated low-privileged user who can create and manage their own survey can store malicious JavaScript in a quota message.
This issue affects LimeSurvey: 7.0.5.
Weakness: CWE-79
Which versions are affected by CVE-2026-16809?
How do I fix CVE-2026-16809?
No fix has been published for CVE-2026-16809 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-2026-16809 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16809 exists.
Sources
Also known as GHSA-qv5f-f9jj-q6qc.