CVE-2026-11780 Cross-site scripting in Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
Authenticated contributors can inject arbitrary scripts via the question_title parameter, 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
- Not needed
- Fix
- None listed
What is CVE-2026-11780?
CVE-2026-11780 is a medium-severity cross-site scripting vulnerability in expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker, published on 16 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'question_title' parameter in all versions up to, and including, 11.2.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-11780?
How do I fix CVE-2026-11780?
No fix has been published for CVE-2026-11780 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-2026-11780 being exploited?
There is no known exploitation of CVE-2026-11780 in the wild and no public exploit code.
Sources
Also known as GHSA-crj5-47f7-xg78.