Vulnerability Report

CVE-2026-5262

Title: Unauthenticated access to Storybook development environment tokens

XSS

Proof Of Concept

No public PoC currently indexed for CVE-2026-5262.

CWE Category CWE-79
Published Date Apr 22, 2026
Modified Date Apr 23, 2026
Exploit Status Not Found
Score 8.0 CVSS v3.1
Exploit Probability (EPSS)
0.07%

Vulnerability Summary

CVE-2026-5262: 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.

Impacted Vendors

G
gitlab 1
J
jenkins 1

Reference Links

https://about.gitlab.com/releases/2026/04/22/patch-release-gitlab-18-11-1-released/ https://gitlab.com/gitlab-org/gitlab/-/work_items/595332 https://hackerone.com/reports/3574642
CVSS v3.1
Source Entity [email protected]
Severity HIGH
8.0
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
6.1
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-5262 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction REQUIRED
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected Stack

No specific products linked.