CVE-2019-5466Public exploitNetwork attack vector

Private label disclosure via unchecked label IDs

Published Jan 28, 2020 · Updated Aug 4, 2024

IDOR in GitLab CE/EE 11.5 and later allows remote authenticated users to read private-project label names through merge-request creation. The new merge-request endpoint accepts user-controlled sequential label_ids values and renders the referenced labels without checking project visibility. Membership in any project with permission to create merge requests is sufficient; exposure is limited to label names from otherwise inaccessible projects.

CVSS severity4.3
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

IDOR in GitLab CE/EE 11.5 and later allows remote authenticated users to read private-project label names through merge-request creation. The new merge-request endpoint accepts user-controlled sequential label_ids values and renders the referenced labels without checking project visibility. Membership in any project with permission to create merge requests is sufficient; exposure is limited to label names from otherwise inaccessible projects.

The record

CVE
CVE-2019-5466
Published
Jan 28, 2020
Updated
Aug 4, 2024
Vendor
GitLab
Product
GitLab
Classifications
CWE-639, T1213.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 28, 2020CVE 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=Affects GitLab CE/EE 11.5 and later
  2. Affected versionversion=Fixed in 12.1.2 in 12.0.4 and in 11.11.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GitLab · GitLabversion=Affects GitLab CE/EE 11.5 and later; version=Fixed in 12.1.2 in 12.0.4 and in 11.11.6

Published CVSS scores

4.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0NVDAV:N/AC:L/Au:S/C:P/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-639Authorization Bypass Through User-Controlled Key
T1213.003Code 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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