CVE-2026-112212: GitLab 18.3 to before 19.3.6, 19.4 to before 19.4.3, 19.5 to before 19.5.1

Affected technology

GitLab · 18.3 to before 19.3.6, 19.4 to before 19.4.3, 19.5 to before 19.5.1
GitLab

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · No privileges required · User interaction required

What an attacker can do

The source says gitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, under certain conditions, an unauthenticated user could have poisoned a shared cache's OAuth/OIDC discovery document to redirect certain flows to an externally controlled server, due to improper trust of user-supplied values when constructing endpoint URLs in cached discovery responses. Vendor/CNA’s CVSS 3.1 assessment (base score 7.5/10) rates confidentiality impact as high; integrity and availability impact as low.