CVE-2026-23625Network attack vector

Stored XSS via unescaped subproject name

Published Jan 19, 2026 · Updated Jan 19, 2026

Stored cross-site scripting in OpenProject 16.3.0 through 16.6.4 allows remote authenticated users to execute script in another user's browser. The Roadmap view's link_to_work_package helper prepends a user-controlled subproject name and marks the combined link html_safe without escaping it. An attacker needs permission to set a project name, and execution requires another user to view a roadmap containing a related work package.

CVSS severity9.0
Critical
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in OpenProject 16.3.0 through 16.6.4 allows remote authenticated users to execute script in another user's browser. The Roadmap view's link_to_work_package helper prepends a user-controlled subproject name and marks the combined link html_safe without escaping it. An attacker needs permission to set a project name, and execution requires another user to view a roadmap containing a related work package.

The record

CVE
CVE-2026-23625
Published
Jan 19, 2026
Updated
Jan 19, 2026
Vendor
OpenProject GmbH
Product
OpenProject
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>= 16.3.0, < 16.6.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenProject GmbH · OpenProjectversion=>= 16.3.0, < 16.6.5

Published CVSS scores

9.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
6.1NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:R/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')
T1189Drive-by Compromise

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

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Your stack

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