CVE-2026-5816

Q: How do I fix CVE-2026-5816?

Upgrade gitlab to 18.10.4 or later.

Q: Is CVE-2026-5816 being actively exploited?

Not that we know of. CVE-2026-5816 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.41% is the estimated probability that it will be exploited in the next 30 days. That is higher than 34% of all scored CVEs.

Q: How severe is CVE-2026-5816?

CVE-2026-5816 has a CVSS v3 base score of 8.0, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-5816 affect?

Published advisories record a fix for gitlab (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

8.0

CVSS v3

NVD

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.

CWE-41

How to fix

Remediation Available

gitlabNVD

Affected:>= 18.10.0, < 18.10.4Fixed in:18.10.4CVE-2026-5816derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

0.41%probability of exploitation in 30 days

34thpercentile

Low risk: more likely to be exploited than 34% of all known CVEs.

References

Vendor Advisory1

about.gitlab.com

Other references2

Related Vulnerabilities

Other CWE-41 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-21269	Medium	4.3	4.6%	-	Fix
CVE-2025-21247	Medium	4.3	3.2%	-	Fix
CVE-2025-21219	Medium	4.3	3.0%	-	Fix
CVE-2025-21189	Medium	4.3	3.0%	-	Fix
CVE-2024-30036	Medium	6.5	2.3%	-	Fix
CVE-2025-21268	Medium	4.3	2.0%	-	Fix

Common questions

How do I fix CVE-2026-5816?

Upgrade gitlab to 18.10.4 or later.

Is CVE-2026-5816 being actively exploited?

Not that we know of. CVE-2026-5816 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.41% is the estimated probability that it will be exploited in the next 30 days. That is higher than 34% of all scored CVEs.

How severe is CVE-2026-5816?

CVE-2026-5816 has a CVSS v3 base score of 8.0, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-5816 affect?

Published advisories record a fix for gitlab (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2026-5816

Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.