CVE-2026-84739
Published:September 29, 2026
Updated:October 09, 2026
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an authenticated user to execute arbitrary JavaScript in the context of another user's browser session due to improper sanitization of path components in the merge request diff viewer.
Affected Packages
https://github.com/gitlabhq/gitlabhq.git (GITHUB):
Affected version(s) >=v19.4.0-rc42 <v19.4.1Fix Suggestion:
Update to version v19.4.1https://github.com/gitlabhq/gitlabhq.git (GITHUB):
Affected version(s) >=v19.0.0-rc42 <v19.2.7Fix Suggestion:
Update to version v19.2.7https://github.com/gitlabhq/gitlabhq.git (GITHUB):
Affected version(s) >=v19.3.0-rc42 <v19.3.3Fix Suggestion:
Update to version v19.3.3Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
0.47