CVE-2026-100755: gitlab — Fix

Description

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.

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CVSS v3.1 Score

4.6

MEDIUM

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

EPSS — Exploit Prediction

0.0009

Probability of exploitation

0.00%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-349 CWE-349

Affected Products

Vendor	Product	Versions
gitlab	gitlab	16.2.0 — 19.2.8
gitlab	gitlab	16.2.0 — 19.2.8
gitlab	gitlab	19.3.0 — 19.3.5
gitlab	gitlab	19.3.0 — 19.3.5
gitlab	gitlab	19.4.0 — 19.4.2
gitlab	gitlab	19.4.0 — 19.4.2

References

Advisories & Patches

https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-2-released/

Other References

https://gitlab.com/gitlab-org/gitlab/-/work_items/627507

Frequently Asked Questions

What is CVE-2026-100755? +

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. It has a CVSS v3.1 base score of 4.6 (MEDIUM).

How severe is CVE-2026-100755? +

CVE-2026-100755 has a CVSS v3.1 score of 4.6 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0009, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-100755? +

CVE-2026-100755 affects products from gitlab, specifically: gitlab. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-100755? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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