CVE-2026-12664: Incorrect Authorization in GitLab

Severity: medium (CVSS 6.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-21 · updated 2026-10-27
Weakness: CWE-863

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.2 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, under certain conditions, could have allowed an authenticated user with a read_api-scoped token to retrieve a project's incoming email address and create work items, bypassing the token's restrictions, due to insufficient scope enforcement on a GraphQL field.

Affected products

GitLab: from 18.2.0 before 19.3.6; from 19.4.0 before 19.4.3; 19.5.0 (and their updates) — fixed in 19.3.6, 19.4.3
GitLab: from 18.2 before 19.3.6; from 19.4 before 19.4.3; from 19.5 before 19.5.1 — fixed in 19.3.6, 19.4.3, 19.5.1

How to fix

Upgrade to a fixed version: GitLab 19.3.6, 19.4.3; GitLab 19.3.6, 19.4.3, 19.5.1. Check the vendor advisory for mitigations.

References

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