Vulnerability-Lookup

CVE-2026-77426 (GCVE-0-2026-77426)

Vulnerability from cvelistv5 – Published: 2026-09-22 20:31 – Updated: 2026-09-23 15:07

Title

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

Summary

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.

Severity

7.1 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-23 15:06 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key
CWE-862 - Missing Authorization

Assigner

GitHub_M mitre root

References

7 references

URL	Tags
https://github.com/Unleash/unleash/security/advis…	x_refsource_CONFIRM
https://github.com/Unleash/unleash/commit/7bb2829…	x_refsource_MISC
https://github.com/Unleash/unleash/commit/ace121c…	x_refsource_MISC
https://github.com/Unleash/unleash/commit/bea7eff…	x_refsource_MISC
https://github.com/Unleash/unleash/commit/c93a963…	x_refsource_MISC
https://github.com/Unleash/unleash/commit/dd61d0e…	x_refsource_MISC
https://github.com/Unleash/unleash/releases/tag/v8.0.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
Unleash	unleash	Affected: < 8.0.3	guessed

Show details on NVD website

JSON

To clipboard

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        "id": "CVE-2026-77426",
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        "metrics": {
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}

FKIE_CVE-2026-77426

Vulnerability from fkie_nvd - Published: 2026-09-22 21:17 - Updated: 2026-09-23 18:12

Severity

7.1 (High) - 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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/Unleash/unleash/commit/7bb2829fc40791aa478e8ffca149c11b0f9cb05a
	security-advisories@github.com	https://github.com/Unleash/unleash/commit/ace121c922d2e3eb6f68d95b0b6ab2fc8d824ea1
	security-advisories@github.com	https://github.com/Unleash/unleash/commit/bea7effd3687425630423f662136d548e100154d
	security-advisories@github.com	https://github.com/Unleash/unleash/commit/c93a963e95e1b7bf1bca2a7729282a48d0eb2f6a
	security-advisories@github.com	https://github.com/Unleash/unleash/commit/dd61d0e10f5977a2e5de78df467c3a17c09fbcef
	security-advisories@github.com	https://github.com/Unleash/unleash/releases/tag/v8.0.3
	security-advisories@github.com	https://github.com/Unleash/unleash/security/advisories/GHSA-72h8-wp98-7hch

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "unleash",
          "vendor": "Unleash",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 8.0.3"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-77426",
  "lastModified": "2026-09-23T18:12:04.247",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-77426",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-23T15:06:51.257660Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-22T21:17:32.327",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Unleash/unleash/commit/7bb2829fc40791aa478e8ffca149c11b0f9cb05a"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Unleash/unleash/commit/ace121c922d2e3eb6f68d95b0b6ab2fc8d824ea1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Unleash/unleash/commit/bea7effd3687425630423f662136d548e100154d"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Unleash/unleash/commit/c93a963e95e1b7bf1bca2a7729282a48d0eb2f6a"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Unleash/unleash/commit/dd61d0e10f5977a2e5de78df467c3a17c09fbcef"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Unleash/unleash/releases/tag/v8.0.3"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Unleash/unleash/security/advisories/GHSA-72h8-wp98-7hch"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        },
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-72H8-WP98-7HCH

Vulnerability from github – Published: 2026-09-22 20:36 – Updated: 2026-09-22 20:36

Summary

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

Details

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.

// 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.

Severity

7.1 (High)


                  
                    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

Show details on source website

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "unleash-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-77426"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639",
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-22T20:36:42Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nMultiple authorization vulnerabilities in Unleash admin API, including a critical missing `await` that completely bypasses a permission check.\n\n## Vulnerability 1: Missing `await` on Permission Check (HIGH)\n\n**File:** `src/lib/features/segment/segment-controller.ts` (line 345)\n\n`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\u003cboolean\u003e`), the variable always receives a truthy Promise object. The `if (!hasFeatureStrategyPermission)` check never triggers.\n\n```typescript\n// BUG: missing await - hasPermission() returns Promise\u003cboolean\u003e\nconst hasFeatureStrategyPermission = this.accessService.hasPermission(\n    req.user, UPDATE_FEATURE_STRATEGY, projectId, environmentId,\n);\nif (!hasFeatureStrategyPermission) { // Always false - Promise is truthy!\n    res.status(403).send();\n    return;\n}\n```\n\n**Impact:** Any authenticated user can modify segment assignments on ANY strategy across ALL projects.\n\n**Fix:** Add `await`: `const hasFeatureStrategyPermission = await this.accessService.hasPermission(...)`\n\n## Vulnerability 2: Cross-Project Variant Read (MEDIUM)\n\n**File:** `src/lib/routes/admin-api/project/variants.ts` (line 213-223)\n\n`GET /api/admin/projects/:projectId/features/:featureName/environments/:environment/variants` completely ignores `projectId`. `getVariantsOnEnv()` only uses `featureName` and `environment`.\n\n**Impact:** Any authenticated user can read variant configs (names, weights, payloads) from any project.\n\n## Vulnerability 3: Cross-Project Strategy Read (MEDIUM)\n\n**File:** `src/lib/features/feature-toggle/feature-toggle-controller.ts` (line 1107-1116)\n\n`GET .../strategies/:strategyId` ignores all params except `strategyId`. Any authenticated user can read any strategy\u0027s full configuration.\n\n## Vulnerability 4: Cross-Project Environment Info Leak (MEDIUM)\n\n**File:** `src/lib/features/feature-toggle/feature-toggle-service.ts` (line 1611)\n\n`getEnvironmentInfo()` doesn\u0027t validate feature belongs to project. Compare with `getFeature()` which calls `validateFeatureBelongsToProject()`.\n\n## Vulnerability 5: Cross-Project Tag Modification (LOW)\n\n**File:** `src/lib/features/feature-toggle/feature-toggle-controller.ts` (line 576-596)\n\n`PUT /:projectId/tags` accepts features array in body without validating they belong to projectId.",
  "id": "GHSA-72h8-wp98-7hch",
  "modified": "2026-09-22T20:36:42Z",
  "published": "2026-09-22T20:36:42Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Unleash/unleash/security/advisories/GHSA-72h8-wp98-7hch"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Unleash/unleash/commit/7bb2829fc40791aa478e8ffca149c11b0f9cb05a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Unleash/unleash/commit/ace121c922d2e3eb6f68d95b0b6ab2fc8d824ea1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Unleash/unleash/commit/bea7effd3687425630423f662136d548e100154d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Unleash/unleash/commit/c93a963e95e1b7bf1bca2a7729282a48d0eb2f6a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Unleash/unleash/commit/dd61d0e10f5977a2e5de78df467c3a17c09fbcef"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Unleash/unleash"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Unleash/unleash/releases/tag/v8.0.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Unleash: Missing await on permission check + cross-project IDOR in admin API"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-77426 (GCVE-0-2026-77426)

FKIE_CVE-2026-77426

GHSA-72H8-WP98-7HCH

Summary

Vulnerability 1: Missing await on Permission Check (HIGH)

Vulnerability 2: Cross-Project Variant Read (MEDIUM)

Vulnerability 3: Cross-Project Strategy Read (MEDIUM)

Vulnerability 4: Cross-Project Environment Info Leak (MEDIUM)

Vulnerability 5: Cross-Project Tag Modification (LOW)

Tags

Sightings

Nomenclature

Related by attack behaviour

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