CVE-2021-39905Public exploitNetwork attack vector

Private group metadata disclosure via unfiltered project response

Published Nov 4, 2021 · Updated Aug 4, 2024

Information disclosure in GitLab CE/EE before 14.2.6 allows remote authenticated users to read private group metadata via the Projects API. The project response includes shared_with_groups without filtering private groups that the requester is unauthorized to view. A public project must be shared with a private group; exposure is limited to that group's ID, name, and full path.

CVSS severity4.2
Medium
EPSS probability0.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in GitLab CE/EE before 14.2.6 allows remote authenticated users to read private group metadata via the Projects API. The project response includes shared_with_groups without filtering private groups that the requester is unauthorized to view. A public project must be shared with a private group; exposure is limited to that group's ID, name, and full path.

The record

CVE
CVE-2021-39905
Published
Nov 4, 2021
Updated
Aug 4, 2024
Vendor
GitLab
Product
GitLab
Classifications
T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 4, 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=>=8.9.6, <14.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=>=8.9.6, <14.2.6

Published CVSS scores

4.2GitLabCVSS: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.

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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 exploitPublished

Weakness, pattern, technique

T1213Data from Information Repositories

Public exploit references

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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