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[ CVE-2026-77426 · Published 22 Sep 2026 ]

Unleash: Missing await on permission check + cross-project IDOR in admin API

CVSS 7.1 EPSS <1%Fix available

[ Description ]Official description

Unleash is an open-source feature management platform. Prior to 8.0.3, the Unleash admin API contains five authorization vulnerabilities. POST /api/admin/segments/strategies assigns the Promise returned by hasPermission without awaiting it, allowing authenticated users to modify segment assignments without UPDATE_FEATURE_STRATEGY permission for the target project and environment. GET /api/admin/projects/:projectId/features/:featureName/environments/:environment/variants does not bind the requested feature to projectId, allowing cross-project variant configuration disclosure. GET .../strategies/:strategyId uses strategyId without validating the project and feature context, allowing cross-project strategy configuration disclosure. getEnvironmentInfo does not validate that the requested feature belongs to the supplied project, allowing cross-project environment information disclosure. PUT /:projectId/tags accepts feature identifiers without verifying that they belong to the URL project, allowing cross-project tag modification. This issue is fixed in version 8.0.3.

[ Fixes ]Fixes and patches

  • unleash-server 8.0.3Fixed version · GitHub Advisories · npm package unleash-server: upgrade to 8.0.3 or later (affected < 8.0.3)

[ Packages ]Affected open-source packages

[ References ]References