Cross-Site Scripting Vulnerability in GitLab AppSec
CVE-2025-2255

8.7HIGH

Key Information:

Vendor
Gitlab
Status
Gitlab
Vendor
CVE Published:
27 March 2025

Badges

👾 Exploit Exists🟡 Public PoC

Summary

A Cross-Site Scripting (XSS) vulnerability has been identified in the GitLab EE/CE AppSec module, affecting all versions prior to 17.8.6 and selected versions in the 17.9 and 17.10 series. Exploitation of this flaw can enable attackers to inject malicious scripts through certain error messages, potentially compromising user sessions and data integrity.

Affected Version(s)

GitLab 13.5.0 < 17.8.6

GitLab 17.9 < 17.9.3

GitLab 17.10 < 17.10.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-2255 - Proof of Concept

References

https://gitlab.com/gitlab-org/gitlab/-/issues/524635
issue-trackingpermissions-required
https://hackerone.com/reports/2994150
technical-descriptionexploitpermissions-required

CVSS V3.1

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks [yvvdwf](https://hackerone.com/yvvdwf) for reporting this vulnerability through our HackerOne bug bounty program
.