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CVE-2026-77426

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

CVSS 4.0 7.1 HIGHEUVD CVSS 4.0 7.1 CVSS 4.0 · [email protected] · Secondary 7.1 HIGHCVSS_V4 Publisher rating HIGHFixed by unleash-server 8.0.3KEV status unknown
Original advisory

cve-program · CVE-2026-77426

Published

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.

Read the publisher's advisory

euvd · EUVD-2026-84867

Published

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.

Read the publisher's advisory

nvd · CVE-2026-77426

Published

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.

Read the publisher's advisory

osv · GHSA-72h8-wp98-7hch

Published

## 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<boolean>`), the variable always receives a truthy Promise object. The `if (!hasFeatureStrategyPermission)` check never triggers. ```typescript // BUG: missing await - hasPermission() returns Promise<boolean> 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 uses `featureName` and `environment`. **Impact:** Any authenticated user can read variant configs (names, weights, payloads) from any project. ## Vulnerability 3: Cross-Project Strategy Read (MEDIUM) **File:** `src/lib/features/feature-toggle/feature-toggle-controller.ts` (line 1107-1116) `GET .../strategies/:strategyId` ignores all params except `strategyId`. Any authenticated user can read any strategy's full configuration. ## Vulnerability 4: Cross-Project Environment Info Leak (MEDIUM) **File:** `src/lib/features/feature-toggle/feature-toggle-service.ts` (line 1611) `getEnvironmentInfo()` doesn't validate feature belongs to project. Compare with `getFeature()` which calls `validateFeatureBelongsToProject()`. ## Vulnerability 5: Cross-Project Tag Modification (LOW) **File:** `src/lib/features/feature-toggle/feature-toggle-controller.ts` (line 576-596) `PUT /:projectId/tags` accepts features array in body without validating they belong to projectId.

Read the publisher's advisory

Affected versions, risk and source history

Exploitation and risk

Source status

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

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cve-program · CVE-2026-77426

Published

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

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 published
22 Sep 2026 20:31:36 UTC
Source modified
23 Sep 2026 15:07:08 UTC
Saved here
23 Oct 2026 15:48:27 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · 7.1 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

euvd · EUVD-2026-84867

Published

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,…

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.

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 22, 2026, 8:31:36 PM

dateUpdated: Sep 23, 2026, 3:07:08 PM

Source published
Sep 22, 2026, 8:31:36 PM (timezone not stated)
Source modified
Sep 23, 2026, 3:07:08 PM (timezone not stated)
Saved here
11 Nov 2026 16:08:59 UTC
Source terms
ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 4.0 · 7.1 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

nvd · CVE-2026-77426

Published

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,…

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.

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-639 · CWE-862

Original publisher date fields

published: 2026-09-22T21:17:32.327

lastModified: 2026-09-23T18:12:04.247

Source published
22 Sep 2026 21:17:32 UTC
Source modified
23 Sep 2026 18:12:04 UTC
Saved here
25 Oct 2026 16:19:04 UTC
Source terms
NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 4.0 · [email protected] · Secondary · 7.1 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

osv · GHSA-72h8-wp98-7hch

Published

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

## 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<boolean>`), the variable always receives a truthy Promise object. The `if (!hasFeatureStrategyPermission)` check never triggers. ```typescript // BUG: missing await - hasPermission() returns Promise<boolean> 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 uses `featureName` and `environment`. **Impact:** Any authenticated user can read variant configs (names, weights, payloads) from any project. ## Vulnerability 3: Cross-Project Strategy Read (MEDIUM) **File:** `src/lib/features/feature-toggle/feature-toggle-controller.ts` (line 1107-1116) `GET .../strategies/:strategyId` ignores all params except `strategyId`. Any authenticated user can read any strategy's full configuration. ## Vulnerability 4: Cross-Project Environment Info Leak (MEDIUM) **File:** `src/lib/features/feature-toggle/feature-toggle-service.ts` (line 1611) `getEnvironmentInfo()` doesn't validate feature belongs to project. Compare with `getFeature()` which calls `validateFeatureBelongsToProject()`. ## Vulnerability 5: Cross-Project Tag Modification (LOW) **File:** `src/lib/features/feature-toggle/feature-toggle-controller.ts` (line 576-596) `PUT /:projectId/tags` accepts features array in body without validating they belong to projectId.

Source published
22 Sep 2026 20:36:42 UTC
Source modified
22 Sep 2026 21:00:05 UTC
Saved here
24 Oct 2026 13:17:17 UTC
Source terms
GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V4 · 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

Publisher rating · HIGH

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 12 Nov 17:32 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current

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