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EUVD-2026-374176

2026-10-06T18:59:38.631402+00:00

EUVD-2026-374176

fkie_cve-2026-77426

2026-10-06T18:59:38.631455+00:00

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.

GHSA-72h8-wp98-7hch — Unleash: Missing await on permission check + cross-project IDOR in admin API

2026-10-06T18:59:38.631492+00:00

Affected: npm: unleash-server

## Summary

Multiple authorization vulnerabilities in Unleash admin API, including a critical missing `await` that completely bypasses a permission check.

## Vulnerability 1: Missing `await` on Permission Check (HIGH)

**File:** `src/lib/features/segment/segment-controller.ts` (line 345)

`POST /api/admin/segments/strategies` has `permission: NONE` at the route level. The handler performs its own check via `this.accessService.hasPermission()`, but **omits the `await` keyword**. Since `hasPermission()` is async (returns `Promise`), the variable always receives a truthy Promise object. The `if (!hasFeatureStrategyPermission)` check never triggers.

```typescript // BUG: missing await - hasPermission() returns Promise const hasFeatureStrategyPermission = this.accessService.hasPermission( req.user, UPDATE_FEATURE_STRATEGY, projectId, environmentId, ); if (!hasFeatureStrategyPermission) { // Always false - Promise is truthy! res.status(403).send(); return; } ```

**Impact:** Any authenticated user can modify segment assignments on ANY strategy across ALL projects.

**Fix:** Add `await`: `const hasFeatureStrategyPermission = await this.accessService.hasPermission(...)`

## Vulnerability 2: Cross-Project Variant Read (MEDIUM)

**File:** `src/lib/routes/admin-api/project/variants.ts` (line 213-223)

`GET /api/admin/projects/:projectId/features/:featureName/environments/:environment/variants` completely ignores `projectId`. `getVariantsOnEnv()` only use…