# CVE-2026-104392: ExpressTech Quiz And Survey Master object injection in deserialization

Source: https://junglewise.ai/threats/cve-2026-104392-deserialization-of-untrusted-data-vulnerability-in-expresstech  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-09. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-104392 · Severity: high · CVSS 8.8 · Published 2026-10-09

Quiz And Survey Master is a WordPress plugin used to create quizzes and surveys on websites. A flaw in how the plugin processes data allows attackers to inject malicious objects that can execute arbitrary code on the server, potentially compromising the entire website and its data.

Technologies: [ExpressTech Quiz and Survey Master](https://junglewise.ai/threats/technologies/quiz-and-survey-master). Vendors: [ExpressTech](https://junglewise.ai/threats/vendors/expresstech).

## Quick answers

**Is CVE-2026-104392 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104392 being exploited in the wild.

**How severe is CVE-2026-104392?** High severity, with a CVSS score of 8.8, published 9 October 2026.

**Which products and versions are affected?** ExpressTech Quiz and Survey Master 11.2.7 and earlier.

**Is there a fix for CVE-2026-104392?** Yes: fixed in 11.2.8. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-104392 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-104392?** Check whether you run ExpressTech Quiz and Survey Master at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 11.2.8

## Technical details

The plugin contains a PHP object injection vulnerability stemming from unsafe deserialization of untrusted input. An attacker with contributor-level privileges can craft malicious serialized objects to trigger remote code execution on the server. The vulnerability affects versions 11.2.7 and earlier; version 11.2.8 and later contain the fix.

## Affected products

- ExpressTech Quiz And Survey Master 11.2.7 and earlier

## Timeline

- 2026-10-09: disclosed
- 2026-10-07: advisory: Patchstack vulnerability disclosure

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/quiz-master-next/vulnerability/wordpress-quiz-and-survey-master-plugin-11-2-7-php-object-injection-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/quiz-master-next/vulnerability/wordpress-quiz-and-survey-master-plugin-11-2-7-php-object-injection-vulnerability?_s_id=cve)

## Related threats

- [ExpressTech Quiz And Survey Master broken access control](https://junglewise.ai/threats/cve-2026-125787-missing-authorization-vulnerability-in-expresstech-quiz-and)
- [ExpressTech Quiz And Survey Master XSS in content injection](https://junglewise.ai/threats/cve-2026-125786-improper-neutralization-of-script-related-html-tags-in-a-web)
- [ExpressTech Quiz And Survey Master object injection](https://junglewise.ai/threats/cve-2026-111408-deserialization-of-untrusted-data-vulnerability-in-expresstech)
- [ExpressTech Quiz And Survey Master DOM-based XSS](https://junglewise.ai/threats/cve-2026-107862-improper-neutralization-of-input-during-web-page-generation)
- [Quiz And Survey Master cross-site scripting](https://junglewise.ai/threats/cve-2026-97289-unauthenticated-cross-site-scripting-xss-in-quiz-and-survey)