Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab

published 2026-02-11 8 mo ago modified 2026-09-10 59 d ago also BIT-gitlab-2026-0595 , EUVD-2026-6217

cvss: 7.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits: 0; none known

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.9 before 18.6.6, 18.7 before 18.7.4, and 18.8 before 18.8.4 that, under certain conditions could have allowed an authenticated user to add unauthorized email addresses to victim accounts through HTML injection in test case titles.

Patch / fix

fixed in 2

bitnami gitlab 18.6.6, 18.7.4, 18.8.4
GitLab GitLab 18.6.6, 18.7.4, 18.8.4

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 8 mo ago (2026-02-12)

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

hackerone.com https://hackerone.com/reports/3486862 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.3	CVSS:3.1/AV:N/AC:L/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	7.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	gitlab	>=13.9.0, <18.6.6 >=18.7.0, <18.7.4 >=18.8.0, <18.8.4	18.6.6 18.7.4 18.8.4

Affected products

GitLab GitLab

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

Technology feeds

GitLab rss critical rss

References

hackerone.com /reports/3486862
technical-description, exploit, permissions-required, web
about.gitlab.com /releases/2026/02/10/patch-release-gitlab-18-8-4-released/
release-notes, vendor-advisory, advisory
gitlab.com /gitlab-org/gitlab/-/issues/584975
issue-tracking, permissions-required, broken-link, report
nvd.nist.gov /vuln/detail/CVE-2026-0595
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.

Summary