CVE-2025-9957Network attack vector

Group fork restriction bypass via missing authorization

Published Apr 22, 2026 · Updated Apr 22, 2026

Incorrect authorization in GitLab CE/EE allows remote authenticated users to bypass group fork prevention settings through its API. The project fork relationship API fails to enforce a parent group's fork-prevention policy when an owner creates the relationship. Project owner permissions are required, and exploitation creates a fork relationship that the group's policy is intended to prohibit; no confidentiality or availability impact is reported.

CVSS severity2.7
Low
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in GitLab CE/EE allows remote authenticated users to bypass group fork prevention settings through its API. The project fork relationship API fails to enforce a parent group's fork-prevention policy when an owner creates the relationship. Project owner permissions are required, and exploitation creates a fork relationship that the group's policy is intended to prohibit; no confidentiality or availability impact is reported.

The record

CVE
CVE-2025-9957
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
GitLab
Product
GitLab
Classifications
CWE-863
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2026Record 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=11.2 <18.9.6
  2. Affected versionversion=18.10 <18.10.4
  3. Affected versionversion=18.11 <18.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

GitLab · GitLabversion=11.2 <18.9.6; version=18.10 <18.10.4; version=18.11 <18.11.1

Published CVSS scores

2.7GitLab Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization

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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