CVE-2026-76931

Deferred Deferred - Pending Action

Stored XSS in Zephyr Project Manager WordPress Plugin

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Wordfence

Description

The Zephyr Project Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘message’ parameter in all versions up to, and including, 3.3.205 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Custom-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability can only be exploited when the 'Directly link to project' plugin setting is disabled.

CVSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-76931

Affected Vendors & Products

Vendor	Product	Version / Range
zephyr_project_manager	zephyr_project_manager	to 3.3.205 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Zephyr Project Manager WordPress plugin. It allows authenticated attackers with Custom-level access or higher to inject malicious scripts via the 'message' parameter. The scripts execute when users access the affected pages. The issue arises due to insufficient input sanitization and output escaping.

Impact Analysis

An attacker could steal user sessions, redirect users to malicious sites, or perform actions on their behalf. This requires the attacker to have Custom-level access or higher in WordPress. The impact is limited to users accessing injected pages when the 'Directly link to project' setting is disabled.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles or HIPAA's security requirements. It may result in data breaches, non-compliance penalties, and loss of user trust due to potential exposure of sensitive information.

Mitigation Strategies

Update the Zephyr Project Manager plugin to the latest version beyond 3.3.205 to address the insufficient input sanitization and output escaping vulnerability.

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