CVE-2026-5262
Received Received - Intake
Unauthorized Token Access via Input Validation Flaw in GitLab Storybook

Publication date: 2026-04-22

Last updated on: 2026-04-23

Assigner: GitLab Inc.

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.
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Meta Information
Published
2026-04-22
Last Modified
2026-04-23
Generated
2026-06-16
AI Q&A
2026-04-22
EPSS Evaluated
2026-06-15
NVD
CVE-2026-5262
EUVD
EUVD-2026-25042
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
gitlab gitlab From 18.10.0 (inc) to 18.10.4 (exc)
gitlab gitlab From 18.10.0 (inc) to 18.10.4 (exc)
gitlab gitlab From 16.1.0 (inc) to 18.9.6 (exc)
gitlab gitlab From 16.1.0 (inc) to 18.9.6 (exc)
gitlab gitlab 18.11.0
gitlab gitlab 18.11.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability in GitLab CE/EE versions from 16.1.0 before 18.9.6, 18.10 before 18.10.4, and 18.11 before 18.11.1 could allow an unauthenticated user to access tokens in the Storybook development environment. The issue arises due to improper input validation under certain conditions.

Impact Analysis

The vulnerability could allow an unauthenticated attacker to gain access to sensitive tokens within the Storybook development environment. This could lead to unauthorized access to protected resources or services, potentially compromising confidentiality and integrity of data.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade GitLab CE/EE to a fixed version. Specifically, update to version 18.9.6 or later if you are using the 18.9 series, 18.10.4 or later for the 18.10 series, or 18.11.1 or later for the 18.11 series. These versions contain the fix for the improper input validation issue that could allow unauthenticated access to tokens in the Storybook development environment.

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