CVE-2026-5262 PUBLISHED

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

Assigner: GitLab
Reserved: 31.03.2026 Published: 22.04.2026 Updated: 22.04.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
CVSS Score: 8

Attack Vector	Network	Scope	Changed
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	GitLab
Product	GitLab
Versions	Default: unaffected affected from 16.1.0 to 18.9.6 (excl.) affected from 18.10 to 18.10.4 (excl.) affected from 18.11 to 18.11.1 (excl.)

Solutions

Upgrade to versions 18.9.6, 18.10.4, 18.11.1 or above.

Credits

Thanks [joaxcar](https://hackerone.com/joaxcar) for reporting this vulnerability through our HackerOne bug bounty program finder

References

Problem Types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE