CVE-2021-22172Public exploitNetwork attack vector

Tag-name disclosure via releases API links

Published Mar 26, 2021 · Updated Aug 3, 2024

Improper authorization in GitLab allows remote authenticated users with Guest access to read tag names from private projects. The Releases API places each release tag in the _links.self URL returned to a Guest even though that role cannot view repository tags or commits. Exploitation requires Guest membership and an authenticated request to a private project's releases endpoint; the disclosed impact is limited to tag-name exposure.

CVSS severity4.3
Medium
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in GitLab allows remote authenticated users with Guest access to read tag names from private projects. The Releases API places each release tag in the _links.self URL returned to a Guest even though that role cannot view repository tags or commits. Exploitation requires Guest membership and an authenticated request to a private project's releases endpoint; the disclosed impact is limited to tag-name exposure.

The record

CVE
CVE-2021-22172
Published
Mar 26, 2021
Updated
Aug 3, 2024
Vendor
GitLab
Product
GitLab
Classifications
CWE-200, T1213.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=>=12.8, <13.6.6
  2. Affected versionversion=>=13.7.0, <13.7.6
  3. Affected versionversion=>=13.8.0, <13.8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=>=12.8, <13.6.6; version=>=13.7.0, <13.7.6; version=>=13.8.0, <13.8.2

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
4.3GitLab Inc.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 exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1213.003Data from Information Repositories: Code 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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