Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in GitLab

published 2024-01-26 2 y ago modified 2026-09-10 59 d ago also BIT-gitlab-2023-5933 , EUVD-2023-58205

cvss: 6.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

An issue has been discovered in GitLab CE/EE affecting all versions after 13.7 before 16.6.6, 16.7 prior to 16.7.4, and 16.8 prior to 16.8.1. Improper input sanitization of user name allows arbitrary API PUT requests.

Patch / fix

fixed in 2

bitnami gitlab 16.6.6, 16.7.4, 16.8.1
GitLab GitLab 16.6.6, 16.7.4, 16.8.1

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 23 mo ago (2024-11-13)

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

hackerone.com https://hackerone.com/reports/2225710 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.4	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
OSV	3.1	6.4	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	gitlab	>=13.7.0, <16.6.6 >=16.7.0, <16.7.4 >=16.8.0, <16.8.1	16.6.6 16.7.4 16.8.1

Affected products

GitLab GitLab

Classification

Weakness

CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page
CWE-79 Improper Neutralization of Input During Web Page Generation

Technology feeds

GitLab rss critical rss

References

hackerone.com /reports/2225710
technical-description, exploit, permissions-required, web
about.gitlab.com /releases/2024/01/25/critical-security-release-gitlab-16-8-1-released/
vendor-advisory, advisory
gitlab.com /gitlab-org/gitlab/-/issues/430236
issue-tracking, permissions-required, broken-link, web
nvd.nist.gov /vuln/detail/CVE-2023-5933
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: Enhance with deb and rpm package type records.

Summary