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CVE-2026-77426— Unleash: Missing await on permission check + cross-project IDOR in admin API

Quick assessment

Affected
Unleash unleash
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 authentica

CVSS 7.1 · High
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I. Basic Information for CVE-2026-77426

Vulnerability Information

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Vulnerability Title
Unleash: Missing await on permission check + cross-project IDOR in admin API
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unleash unleash < 8.0.3 -

II. Public POCs for CVE-2026-77426

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III. Intelligence Information for CVE-2026-77426

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Other References for CVE-2026-77426 (1)

Other References for CVE-2026-77426 (6)

Same Patch Batch · Unleash · 2026-09-22 · 4 CVEs total

CVE-2026-76910 5.3 MEDIUM Unleash: Clone-feature lets a user copy a feature from a project they cannot read
CVE-2026-77425 4.3 MEDIUM Unleash: A project member can reorder activation strategies belonging to any other project
CVE-2026-76909 2.1 LOW Unleash: CR-approval email renders user-controlled raw HTML

IV. Related Vulnerabilities

Same product: unleash
Same vendor: Unleash
Same weakness: CWE-639

V. Comments for CVE-2026-77426

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