CVE-2021-39886Network attack vector

Confidential Epic reference disclosure via unchecked issue moves

Published Oct 5, 2021 · Updated Aug 4, 2024

Improper access control in GitLab 10.6 through 14.1.6, 14.2 through 14.2.4, and 14.3.0 lets remote authenticated users read Epic references. The same-group issue-move workflow fails to reapply permission rules before resolving confidential Epic references. Exploitation requires low-privileged access, user interaction, and an issue linked to a confidential Epic that the attacker cannot otherwise view.

CVSS severity2.6
Low
EPSS probability0.56%
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 10.6 through 14.1.6, 14.2 through 14.2.4, and 14.3.0 lets remote authenticated users read Epic references. The same-group issue-move workflow fails to reapply permission rules before resolving confidential Epic references. Exploitation requires low-privileged access, user interaction, and an issue linked to a confidential Epic that the attacker cannot otherwise view.

The record

CVE
CVE-2021-39886
Published
Oct 5, 2021
Updated
Aug 4, 2024
Vendor
GitLab
Product
GitLab
Classifications
T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 5, 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=>=10.6, <14.1.7
  2. Affected versionversion=>=14.2, <14.2.5
  3. Affected versionversion=>=14.3, <14.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=>=10.6, <14.1.7; version=>=14.2, <14.2.5; version=>=14.3, <14.3.1

Published CVSS scores

2.6GitLabCVSS:3.1/AV:N/AC:H/PR:L/UI:R/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

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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