CVE-2026-11780 json
Quiz and Survey Master (QSM) <= 11.2.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'question_title' Parameter
published 2026-08-16 2 mo ago modified 2026-08-20 2 mo ago also EUVD-2026-59860
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 36%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/66334c29-c9d6-48b0-8d6b-bae588da0331?source=cve
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.1.4/php/admin/options-page-questions-tab.php#L1580
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.1.4/php/rest-api.php#L741
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.1.4/php/rest-api.php#L301
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.1.4/php/admin/options-page-questions-tab.php#L1557
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.0.0/php/admin/options-page-questions-tab.php#L1580
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.0.0/php/rest-api.php#L741
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.0.0/php/rest-api.php#L301
- plugins.trac.wordpress.org /browser/quiz-master-next/tags/11.0.0/php/admin/options-page-questions-tab.php#L1557
- plugins.trac.wordpress.org /changeset?reponame=&old=3609172%40quiz-master-next&new=3609172%40quiz-master-next
- plugins.trac.wordpress.org /changeset?reponame=&old=3612474%40quiz-master-next&new=3612474%40quiz-master-next
Sources
- CVE List CVE-2026-11780
- NVD CVE-2026-11780
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.