CVE-2026-1090
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
Description
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.
INFO
Published Date :
March 11, 2026, 4:16 p.m.
Last Modified :
March 13, 2026, 12:36 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | ceab7361-8a18-47b1-92ba-4d7d25f6715a | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update GitLab to a recent patched version.
- Ensure the `markdown_placeholders` feature flag is disabled if not needed.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-1090.
| URL | 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-1090 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-1090
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-1090 vulnerability anywhere in the article.
-
CybersecurityNews
GitLab Security Update – Patch for XSS and API DoS Vulnerabilities
GitLab Security Update Patch XSS and API DoS Vulnerabilities GitLab has released urgent security updates for its Community Edition (CE) and Enterprise Edition (EE) to address a wide range of vulnerabi ... Read more
-
Daily CyberSecurity
Code Red: GitLab’s Latest Security Update Patches High-Severity XSS and API DoS Vulnerabilities
GitLab has released critical security updates—versions 18.9.2, 18.8.6, and 18.7.6—for both Community Edition (CE) and Enterprise Edition (EE). This emergency patch addresses several high-severity flaw ... Read more
The following table lists the changes that have been made to the
CVE-2026-1090 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* versions from (including) 18.8.0 up to (excluding) 18.8.6 *cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* versions from (including) 18.9.0 up to (excluding) 18.9.2 *cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* versions from (including) 18.8.0 up to (excluding) 18.8.6 *cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* versions from (including) 18.9.0 up to (excluding) 18.9.2 *cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* versions from (including) 10.6.0 up to (excluding) 18.7.6 *cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* versions from (including) 10.6.0 up to (excluding) 18.7.6 Added Reference Type GitLab Inc.: https://about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/ Types: Release Notes, Vendor Advisory Added Reference Type GitLab Inc.: https://gitlab.com/gitlab-org/gitlab/-/work_items/586478 Types: Broken Link Added Reference Type GitLab Inc.: https://hackerone.com/reports/3502450 Types: Permissions Required -
New CVE Received by [email protected]
Mar. 11, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Added CWE CWE-79 Added Reference https://about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released/ Added Reference https://gitlab.com/gitlab-org/gitlab/-/work_items/586478 Added Reference https://hackerone.com/reports/3502450