CVE-2026-84739NVD

Vulnerability Summary

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.

Severity Level

HIGH(8.7)

Published Date

Sep 29, 2026

Last Modified

Oct 5, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.47%Probability

Root Weakness (CWE)

CWE-79: Cross-site Scripting (XSS) ↗

The software does not neutralize user-controllable input before it is placed in output that is used as a web page.

CVSS v3.1 Base Metrics — Score 8.7 (HIGH)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

Affected & Patched Versions

Affected Versions

Gitlab Gitlab >= 13.11.0 and < 19.2.7
Gitlab Gitlab >= 19.3.0 and < 19.3.3
Gitlab Gitlab

Patched Versions

Gitlab Gitlab 19.2.7
Gitlab Gitlab 19.3.3

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