CVE-2026-5262

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

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.1.0 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 that under certain conditions could have allowed an unauthenticated user to access tokens in the Storybook development environment due to improper input validation.

Affected

GitLab

CVSS v3.1 NVD

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

CVSS v3.1 GITLAB

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

EPSS

0.36% chance of exploitation in the next 30 days, 28th percentile

Published

2026-04-22

Proof-of-concept exploits (1)

• https://hackerone.com/reports/3574642

Security advisories

• https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released

References

• CVE Record
• NVD entry