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CVE-2023-5226

23
FAUCET Score

CVE-2023-5226 is a high-severity vulnerability affecting GitLab versions before 16.4.3, 16.5.3, and 16.6.1. This flaw allows an unauthenticated attacker to bypass prohibited branch checks using a specially crafted branch name, enabling manipulation of repository content through the GitLab UI. The vulnerability has a CVSS score of 7.5, indicating a high impact on integrity with low attack complexity and no user interaction required. While there is no known active exploitation, public exploit code, or Metasploit module, the vulnerability has garnered some community discussion and media coverage, suggesting awareness within the security community.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0, < 16.4.3CPE match
cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
>= 16.5, < 16.5.3CPE match
cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
>= 16.6, < 16.6.1CPE match
cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*
< 16.4.3CPE matchmatch criteria
cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*
< 16.4.3CPE matchmatch criteria
cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.8MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.55%
Probability of exploitation in next 30 days
EPSS Percentile
42.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0055 is in the 20th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

gitlab.com / gitlab-org/gitlab/-/issues/426400
Broken LinkVendor Advisory
hackerone.com / reports/2173053
Permissions RequiredThird Party Advisory