Is CVE-2026-76931 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-76931 being exploited in the wild.

How severe is CVE-2026-76931?

Medium severity, with a CVSS score of 6.4, published 8 September 2026.

Which products and versions are affected?

Zephyr Project Manager up to and including 3.3.205.

Is there a fix for CVE-2026-76931?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-76931 attacked?

It is attacked over the network.

Am I affected by CVE-2026-76931?

Check whether you run Zephyr Project Manager 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.

CVE-2026-76931: Zephyr Project Manager stored cross-site scripting in message parameter

CVE-2026-76931 · Severity: medium · CVSS 6.4 · Published 2026-09-08

Zephyr Project Manager is a WordPress plugin used to manage projects and tasks. The plugin fails to properly sanitize user input in the message parameter, allowing authenticated users with Custom-level access or higher to inject malicious scripts that execute when other users view affected pages. This can lead to session hijacking, credential theft, or defacement of project pages.

Vendors: Zephyr Project.

Quick answers

Is CVE-2026-76931 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-76931 being exploited in the wild.
How severe is CVE-2026-76931?: Medium severity, with a CVSS score of 6.4, published 8 September 2026.
Which products and versions are affected?: Zephyr Project Manager up to and including 3.3.205.
Is there a fix for CVE-2026-76931?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-76931 attacked?: It is attacked over the network.
Am I affected by CVE-2026-76931?: Check whether you run Zephyr Project Manager 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.

Technical details

The vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Zephyr Project Manager WordPress plugin affecting versions up to and including 3.3.205. The root cause is insufficient input sanitization and output escaping of the 'message' parameter in the plugin's code (likely in AjaxHandler.php and/or Projects.php based on referenced files). The vulnerability requires authentication with Custom-level access or above and is only exploitable when the 'Directly link to project' plugin setting is disabled. An authenticated attacker can inject arbitrary JavaScript that persists in the database and executes in the browsers of other users who access the affected page, enabling session hijacking, credential theft, or malicious actions performed on behalf of other users.

Affected products

Zephyr Project Zephyr Project Manager up to and including 3.3.205

Timeline

2026-09-08: disclosed

References

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