CVE-2026-76931Network attack vector

Stored script execution via unsanitized messages

Published Sep 8, 2026 · Updated Sep 8, 2026

Stored XSS in Zephyr Project Manager 3.3.205 and earlier allows remote authenticated users to execute scripts through project messages. The AjaxHandler, Projects, and Tasks message paths store the message parameter without sufficient sanitization and render it without adequate output escaping. Exploitation requires Custom-level access or above and the Directly link to project setting to be disabled; injected scripts run when an affected page is viewed.

CVSS severity6.4
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Zephyr Project Manager 3.3.205 and earlier allows remote authenticated users to execute scripts through project messages. The AjaxHandler, Projects, and Tasks message paths store the message parameter without sufficient sanitization and render it without adequate output escaping. Exploitation requires Custom-level access or above and the Directly link to project setting to be disabled; injected scripts run when an affected page is viewed.

The record

CVE
CVE-2026-76931
Published
Sep 8, 2026
Updated
Sep 8, 2026
Vendor
Dylan James
Product
Zephyr Project Manager
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.3.205

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Dylan James · Zephyr Project Managerversion=0 <=3.3.205

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo