Authentication Bypass Using an Alternate Path or Channel in GitLab

published 2025-05-09 18 mo ago modified 2026-09-08 2 mo ago also BIT-gitlab-2025-0549 , EUVD-2025-14174

cvss: 6.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits: 0; none known

An issue has been discovered in GitLab CE/EE affecting all versions starting from 17.3 prior to 17.9.8, from 17.10 prior to 17.10.6, and from 17.11 prior to 17.11.2. A security vulnerability allows attackers to bypass Device OAuth flow protections, enabling authorization form submission through minimal user interaction.

Patch / fix

fixed in 2

bitnami gitlab 17.11.2
GitLab GitLab 17.9.8, 17.10.6, 17.11.2

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 18 mo ago (2025-05-09)

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

hackerone.com https://hackerone.com/reports/2927555 referenced PoC, tagged "exploit" by a source, unverified
gitlab.com https://gitlab.com/gitlab-org/gitlab/-/issues/513996 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
OSV	3.1	6.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	gitlab	>=17.3.0, <17.11.2	17.11.2

Affected products

GitLab GitLab

Classification

Weakness

CWE-288 Authentication Bypass Using an Alternate Path or Channel

Technology feeds

GitLab rss critical rss

References

hackerone.com /reports/2927555
technical-description, exploit, permissions-required, web
gitlab.com /gitlab-org/gitlab/-/issues/513996
issue-tracking, permissions-required, exploit, evidence
nvd.nist.gov /vuln/detail/CVE-2025-0549
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary