CVE-2026-1090

HIGH

GitLab 10.6-18.7.5, 18.8-18.8.5, 18.9-18.9.1 - Stored XSS via Markdown Injection

Title source: llm
STIX 2.1

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 10.6 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user, when the `markdown_placeholders` feature flag was enabled, to inject JavaScript in a browser due to improper sanitization of placeholder content in markdown processing.

References (3)

Core 3
Core References
Third Party Advisory technical-description exploit permissions-required
https://hackerone.com/reports/3502450

Scores

CVSS v3 8.7
EPSS 0.0008
EPSS Percentile 24.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-79
Status published
Products (1)
gitlab/gitlab 10.6.0 - 18.7.6 (2 CPE variants)
Published Mar 11, 2026
Tracked Since Mar 11, 2026