CVE-2021-39936Network attack vector

Wiki access via deploy-token authorization flaw

Published Dec 13, 2021 · Updated Aug 4, 2024

Improper access control in GitLab CE/EE 10.7 through 14.5 allows remote authenticated users to read a project's disabled wiki via a deploy token. The Git access authorization path checks repository access instead of the project's wiki access level, so deploy-token Git operations can reach a wiki that administrators disabled. Access requires possession of a valid deploy token and network reachability; the reported consequence is unauthorized confidentiality access to wiki contents, not modification or service interruption.

CVSS severity4.3
Medium
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in GitLab CE/EE 10.7 through 14.5 allows remote authenticated users to read a project's disabled wiki via a deploy token. The Git access authorization path checks repository access instead of the project's wiki access level, so deploy-token Git operations can reach a wiki that administrators disabled. Access requires possession of a valid deploy token and network reachability; the reported consequence is unauthorized confidentiality access to wiki contents, not modification or service interruption.

The record

CVE
CVE-2021-39936
Published
Dec 13, 2021
Updated
Aug 4, 2024
Vendor
GitLab
Product
GitLab
Classifications
CWE-863, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>=10.7, <14.3.6
  2. Affected versionversion=>=14.4, <14.4.4
  3. Affected versionversion=>=14.5, <14.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=>=10.7, <14.3.6; version=>=14.4, <14.4.4; version=>=14.5, <14.5.2

Published CVSS scores

4.0[email protected]AV:N/AC:L/Au:S/C:P/I:N/A:N
3.5[email protected]CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
4.3[email protected]CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Missing Authorization
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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