Is CVE-2021-39904 in the CISA KEV catalog?

No. CVE-2021-39904 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-39904?

CVE-2021-39904 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2021-39904?

CVE-2021-39904 has an EPSS score of 0.81% (53th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-39904?

Upgrade gitlab on debian unstable to 15.10.8+ds1-2 or later.

CVE & CISA-KEV Catalog

CVE-2021-39904

MEDIUM

4.3

CVSS v3

NVD

Description

An Improper Access Control vulnerability in the GraphQL API in all versions of GitLab CE/EE starting from 13.1 before 14.2.6, all versions starting from 14.3 before 14.3.4, and all versions starting from 14.4 before 14.4.1 allows a Merge Request creator to resolve discussions and apply suggestions after a project owner has locked the Merge Request

CWE-863Incorrect Authorization

How to fix

Remediation Available

gitlabDebian

Fixed in:15.10.8+ds1-2CVE-2021-39904

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 ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.81%probability of exploitation in 30 days

53rdpercentile

Moderate risk: more likely to be exploited than 53% of all known CVEs.

References

Exploit1

gitlab.com

Vendor Advisory1

gitlab.com

Third-Party Advisory1

hackerone.com

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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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 2026-06-12.