GitLab Community Edition/Enterprise Edition up to 18.9.5/18.10.3/18.11.0 Access Token cross site scripting

Summaryinfo

A vulnerability was found in GitLab Community Edition and Enterprise Edition up to 18.9.5/18.10.3/18.11.0. It has been rated as problematic. Impacted is an unknown function of the component Access Token Handler. This manipulation causes cross site scripting. This vulnerability appears as CVE-2026-5262. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in GitLab Community Edition and Enterprise Edition up to 18.9.5/18.10.3/18.11.0 and classified as problematic. Affected by this vulnerability is an unknown function of the component Access Token Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. The summary by CVE is:

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.

The weakness was presented by joaxcar. It is possible to read the advisory at gitlab.com. This vulnerability is known as CVE-2026-5262 since 03/31/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 18.9.6, 18.10.4 or 18.11.1 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Bug Tracking Software

Vendor

• GitLab

Name

• Community Edition
• Enterprise Edition

Version

• 18.0
• 18.1
• 18.2
• 18.3
• 18.4
• 18.5
• 18.6
• 18.7
• 18.8
• 18.9
• 18.9.0
• 18.9.1
• 18.9.2
• 18.9.3
• 18.9.4
• 18.9.5
• 18.10
• 18.10.0
• 18.10.1
• 18.10.2
• 18.10.3
• 18.11.0

License

• open-source

Website

• Vendor: https://gitlab.com/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion