Vulnerability Report

CVE-2026-6335

Title: Arbitrary code execution in user browser session due to improper sanitization in GitLab CE/EE

XSS

Proof Of Concept

No public PoC currently indexed for CVE-2026-6335.

CWE Category CWE-79

Published Date May 14, 2026

Modified Date May 15, 2026

Exploit Status Not Found

Score 5.4 CVSS v3.1

Exploit Probability (EPSS)

0.03%

Vulnerability Summary

CVE-2026-6335: GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.11 before 18.11.3 that under certain conditions could have allowed an authenticated user to execute arbitrary code in another user's browser session due to improper sanitization.

Impacted Vendors

gitlab 1

Reference Links

https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/ https://gitlab.com/gitlab-org/gitlab/-/work_items/596760 https://hackerone.com/reports/3673647

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.4

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-6335 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 15, 2026 MODIFIED

Vulnerability data updated via NVD.

May 14, 2026 MODIFIED

Vulnerability data updated via NVD.

May 14, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected Stack

No specific products linked.