CVE-2026-100755 PUBLISHED

Acceptance of Extraneous Untrusted Data With Trusted Data in GitLab

Assigner: GitLab
Reserved: 26.09.2026 Published: 13.10.2026 Updated: 13.10.2026

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.2 before 19.2.8, 19.3 before 19.3.5, and 19.4 before 19.4.2 that, under certain deployment configurations, could have allowed an authenticated user to poison cached page content served to other users due to improper cache key construction.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
CVSS Score: 4.6

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	Required	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	GitLab
Product	GitLab
Versions	Default: unaffected affected from 16.2 to 19.2.8 (excl.) affected from 19.3 to 19.3.5 (excl.) affected from 19.4 to 19.4.2 (excl.)

Solutions

Upgrade to versions 19.2.8, 19.3.5, 19.4.2 or above.

Credits

This vulnerability has been discovered internally by GitLab team member Peter Arts finder

References

Problem Types

CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data CWE