CVE-2026-5262
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 16.1.0 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 that under certain conditions could have allowed an unauthenticated user to access tokens in the Storybook development environment due to improper input validation.
INFO
Published Date :
April 22, 2026, 5:16 p.m.
Last Modified :
April 23, 2026, 8:38 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update GitLab to version 18.9.6 or later.
- Update GitLab to version 18.10.4 or later.
- Update GitLab to version 18.11.1 or later.
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-2026-5262.
| URL | Resource |
|---|---|
| https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/ | Release Notes Vendor Advisory |
| https://gitlab.com/gitlab-org/gitlab/-/work_items/595332 | Broken Link |
| https://hackerone.com/reports/3574642 | 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-2026-5262 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-2026-5262
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-2026-5262 vulnerability anywhere in the article.
-
Daily CyberSecurity
GitLab Security Update: High-Severity Vulnerabilities Patched in April Release
GitLab has released a vital set of security updates for both Community Edition (CE) and Enterprise Edition (EE) to address a range of vulnerabilities, including high-severity flaws that could allow un ... Read more
The following table lists the changes that have been made to the
CVE-2026-5262 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]
Apr. 23, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* versions from (including) 18.10.0 up to (excluding) 18.10.4 *cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* versions from (including) 18.10.0 up to (excluding) 18.10.4 *cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:* versions from (including) 16.1.0 up to (excluding) 18.9.6 *cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:* versions from (including) 16.1.0 up to (excluding) 18.9.6 *cpe:2.3:a:gitlab:gitlab:18.11.0:*:*:*:community:*:*:* *cpe:2.3:a:gitlab:gitlab:18.11.0:*:*:*:enterprise:*:*:* Added Reference Type GitLab Inc.: https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/ Types: Release Notes, Vendor Advisory Added Reference Type GitLab Inc.: https://gitlab.com/gitlab-org/gitlab/-/work_items/595332 Types: Broken Link Added Reference Type GitLab Inc.: https://hackerone.com/reports/3574642 Types: Permissions Required -
New CVE Received by [email protected]
Apr. 22, 2026
Action Type Old Value New Value Added Description GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.1.0 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 that under certain conditions could have allowed an unauthenticated user to access tokens in the Storybook development environment due to improper input validation. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N Added CWE CWE-79 Added Reference https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/ Added Reference https://gitlab.com/gitlab-org/gitlab/-/work_items/595332 Added Reference https://hackerone.com/reports/3574642