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CVE-2021-39909

MEDIUM
5.3
CVSS Score
Published: November 4, 2021 at 11:03 PM UTC
Updated: June 17, 2026 at 04:04 AM UTC
1 product affected across 1 vendorGitLab

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.6%

Description

Lack of email address ownership verification in the CODEOWNERS feature in all versions of GitLab EE starting from 11.3 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 an attacker to bypass CODEOWNERS Merge Request approval requirement under rare circumstances

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GitLab· GitLabmaven
95%
v < 14.2.6v < 14.3.4v < 14.4.111.2.0 ≤ v < 14.3.411.3.0 ≤ v < 14.2.611.3.0 ≤ v < 14.4.114.3.0 ≤ v < 14.3.414.4.0
Affected range stops below 14.2.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.3.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 14.4.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39909.json
x_refsource_MISCBroken Link
Source: [email protected]
https://gitlab.com/gitlab-org/gitlab/-/issues/335191
x_refsource_MISCPermissions RequiredThird Party Advisory
Source: [email protected]
https://hackerone.com/reports/1237750

CVSS

5.3MEDIUMGitLab
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-347

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