CVE-2026-10086

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

GitLab has remediated an issue in GitLab EE affecting all versions from 16.4 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1 that under certain conditions could have allowed an authenticated user with developer-role permissions to execute arbitrary client-side code in the context of another user's session, due to improper sanitization of user-supplied input.

Affected

GitLab

CVSS v3.1 NVD

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

CVSS v3.1 GITLAB

8.7 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

EPSS

0.35% chance of exploitation in the next 30 days, 27th percentile

Published

2026-06-25

Updated

2026-06-26

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3734800

Security advisories

• https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-1-1-released

References

• CVE Record
• NVD entry