electron-userland electron-builder/builder-util-runtime up to 26.14.x Personal Access Token information disclosure

Summaryinfo

A vulnerability categorized as problematic has been discovered in electron-userland electron-builder and builder-util-runtime up to 26.14.x. Impacted is an unknown function of the component Personal Access Token Handler. Such manipulation leads to information disclosure. This vulnerability is documented as CVE-2026-54673. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in electron-userland electron-builder and builder-util-runtime up to 26.14.x. Affected by this issue is an unknown functionality of the component Personal Access Token Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

electron-updater allows for automatic updates for Electron apps. Prior to 9.7.0, the HTTP redirect handler (HttpExecutor.prepareRedirectUrlOptions) only stripped a credential header whose key string matched exactly lowercase "authorization", exposing credentials. Other credential-bearing headers — most notably PRIVATE-TOKEN (used by GitLab's personal access token flow) and mixed-case Authorization (used by GitLab's Bearer/OAuth flow) — were not stripped and could be forwarded to an attacker-controlled cross-origin redirect destination. This issue has been fixed in version 9.7.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-54673 since 06/16/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 26.15.0 eliminates this vulnerability. Applying the patch 22a7532bd01b9fb42cff7c58d599c7ad683569fe is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• electron-userland

Name

• builder-util-runtime
• electron-builder

Version

• 26.0
• 26.1
• 26.2
• 26.3
• 26.4
• 26.5
• 26.6
• 26.7
• 26.8
• 26.9
• 26.10
• 26.11
• 26.12
• 26.13
• 26.14

License

• open-source

Website

• Product: https://github.com/electron-userland/electron-builder/

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