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CVE-2026-5816

GitLab vulnerability

8.0 HIGHEPSS 0.59%
  1. Published22 Apr 2026

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.10 before 18.10.4 and 18.11 before 18.11.1 that could have allowed an unauthenticated user to execute arbitrary JavaScript in a user's browser session due to improper path validation under certain conditions.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected products

GitLab18.11.0 · ≥ 18.10.0 < 18.10.4

Remediation

Fixed in
GitLab≥ 18.10.4

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-859789.8
An unauthenticated remote code execution vulnerability exists in the Policy Manager…
CVE-2025-244708.6
An Improper Resolution of Path Equivalence vulnerability [CWE-41] in FortiPortal 7.4.0…

Frequently asked

Is CVE-2026-5816 being actively exploited?

CVE-2026-5816 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.59%.

How severe is CVE-2026-5816?

CVE-2026-5816 has a CVSS 3.1 base score of 8.0, rated high. EPSS estimates a 0.59% probability of exploitation.

Which products are affected by CVE-2026-5816?

Affected products include GitLab.

How do I fix CVE-2026-5816?

Upgrade affected software to a fixed version, for example GitLab 18.10.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-5816 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.