CVE-2026-1090

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 10.6 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user, when the `markdown_placeholders` feature flag was enabled, to inject JavaScript in a browser due to improper sanitization of placeholder content in markdown processing.

CVSS v3 8.7 HIGH

8.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.3 / Impact : 5.8

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/	Release Notes Vendor Advisory
https://gitlab.com/gitlab-org/gitlab/-/work_items/586478	Broken Link
https://hackerone.com/reports/3502450	Permissions Required

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:gitlab:gitlab:::::community:::*
	cpe:2.3:a:gitlab:gitlab:::::enterprise:::*
	cpe:2.3:a:gitlab:gitlab:::::community:::*
	cpe:2.3:a:gitlab:gitlab:::::enterprise:::*
	cpe:2.3:a:gitlab:gitlab:::::community:::*
	cpe:2.3:a:gitlab:gitlab:::::enterprise:::*

History

13 Mar 2026, 12:36

Type	Values Removed	Values Added
References	~~() https://about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/ -~~	() https://about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/ - Release Notes, Vendor Advisory
References	~~() https://gitlab.com/gitlab-org/gitlab/-/work_items/586478 -~~	() https://gitlab.com/gitlab-org/gitlab/-/work_items/586478 - Broken Link
References	~~() https://hackerone.com/reports/3502450 -~~	() https://hackerone.com/reports/3502450 - Permissions Required
CPE		cpe:2.3:a:gitlab:gitlab:::::enterprise:::* cpe:2.3:a:gitlab:gitlab:::::community:::*
First Time		Gitlab Gitlab gitlab

11 Mar 2026, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-11 16:16

Updated : 2026-03-13 12:36

NVD link : CVE-2026-1090

Mitre link : CVE-2026-1090

CVE.ORG link : CVE-2026-1090

JSON object : View

Products Affected

gitlab

gitlab

CWE

CWE-79

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

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