Vulnerability-Lookup

GHSA-8XCJ-9HFR-FH9J

Vulnerability from github – Published: 2026-09-22 20:34 – Updated: 2026-09-22 20:34

Summary

Unleash: Clone-feature lets a user copy a feature from a project they cannot read

Details

Summary

The clone-feature endpoint supports copying features across projects, but it does not verify that the caller can access the source project. A user with create permissions in one project can clone a feature from another project they cannot read and then inspect the copied configuration.

This vulnerability cannot be confirmed without Enterprise access. Report is based on a circumstantial evidence in the open-source repository.

Details

src/lib/features/feature-toggle/feature-toggle-service.ts implements cloneFeatureToggle. This operation needs authorization for both sides: permission to read/copy the source feature and permission to create the destination feature.

The clone path validates permissions against the destination project, but not against the source project that owns featureName. Because feature names are globally unique, a caller can reference a feature outside projects they can access.

PoC

Create or identify two projects: P1 with a private or restricted feature named secret-feature, and P2 where the attacker has clone/create permissions.
Authenticate as the attacker.
Send:

POST /api/admin/projects/P2/features/secret-feature/clone
Content-Type: application/json

{ "name": "secret-feature-copy" }

Open P2 and inspect secret-feature-copy. Verify if strategy parameters, constraints, variants, and variant payloads from the source feature have been copied.

Impact

Users with permissions on one project can disclose feature configuration from another project if they know or guess the source feature name. Feature names could be available in more public applications that have a common SDK access to multiple projects.

Severity

5.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "unleash-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-76910"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-22T20:34:40Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nThe clone-feature endpoint supports copying features across projects, but it does not verify that the caller can access the source project. A user with _create_ permissions in one project can clone a feature from another project they cannot read and then inspect the copied configuration.\n\nThis vulnerability cannot be confirmed without Enterprise access. Report is based on a circumstantial evidence in the open-source repository.\n\n### Details\n`src/lib/features/feature-toggle/feature-toggle-service.ts` implements `cloneFeatureToggle`. This operation needs authorization for both sides: permission to read/copy the source feature and permission to create the destination feature.\n\nThe clone path validates permissions against the destination project, but not against the source project that owns `featureName`. Because feature names are globally unique, a caller can reference a feature outside projects they can access.\n\n### PoC\n1. Create or identify two projects: `P1` with a private or restricted feature named `secret-feature`, and `P2` where the attacker has clone/create permissions.\n2. Authenticate as the attacker.\n3. Send:\n\n```http\nPOST /api/admin/projects/P2/features/secret-feature/clone\nContent-Type: application/json\n\n{ \"name\": \"secret-feature-copy\" }\n```\n\n4. Open `P2` and inspect `secret-feature-copy`. Verify if strategy parameters, constraints, variants, and variant payloads from the source feature have been copied.\n\n### Impact\nUsers with permissions on one project can disclose feature configuration from another project if they know or guess the source feature name. Feature names could be available in more public applications that have a common SDK access to multiple projects.",
  "id": "GHSA-8xcj-9hfr-fh9j",
  "modified": "2026-09-22T20:34:40Z",
  "published": "2026-09-22T20:34:40Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Unleash/unleash/security/advisories/GHSA-8xcj-9hfr-fh9j"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Unleash/unleash/commit/2dc6ac0e8ba524ec7a2e9bc96a0e01d9d6f5a35a"
    },
    {
      "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:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Unleash: Clone-feature lets a user copy a feature from a project they cannot read"
}

CVE-2026-76910 (GCVE-0-2026-76910)

Vulnerability from cvelistv5 – Published: 2026-09-22 20:21 – Updated: 2026-09-23 19:40

Title

Unleash: Clone-feature lets a user copy a feature from a project they cannot read

Summary

Unleash is an open-source feature management platform. Prior to 8.0.3, cloneFeatureToggle and POST /api/admin/projects/:projectId/features/:featureName/clone authorize creation in the destination project but do not verify access to the source project. Because feature names are globally unique, a user with create or clone permission in one project who knows or guesses another project's feature name can copy that feature into the authorized project and inspect its strategy parameters, constraints, variants, and variant payloads. This issue is fixed in version 8.0.3.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-23 19:39 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

GitHub_M mitre root Scorecard

References

3 references

URL	Tags
https://github.com/Unleash/unleash/security/advis…	x_refsource_CONFIRM
https://github.com/Unleash/unleash/commit/2dc6ac0…	x_refsource_MISC
https://github.com/Unleash/unleash/releases/tag/v8.0.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
Unleash	unleash	Affected: < 8.0.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-76910",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-23T19:39:54.672469Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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          "dateUpdated": "2026-09-23T19:40:00.468Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/Unleash/unleash/security/advisories/GHSA-8xcj-9hfr-fh9j"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "unleash",
          "vendor": "Unleash",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 8.0.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Unleash is an open-source feature management platform. Prior to 8.0.3, cloneFeatureToggle and POST /api/admin/projects/:projectId/features/:featureName/clone authorize creation in the destination project but do not verify access to the source project. Because feature names are globally unique, a user with create or clone permission in one project who knows or guesses another project\u0027s feature name can copy that feature into the authorized project and inspect its strategy parameters, constraints, variants, and variant payloads. This issue is fixed in version 8.0.3."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
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            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
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            "vulnAvailabilityImpact": "NONE",
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            "vulnIntegrityImpact": "NONE"
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      "problemTypes": [
        {
          "descriptions": [
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              "lang": "en",
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      "providerMetadata": {
        "dateUpdated": "2026-09-22T20:21:35.069Z",
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          "tags": [
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      "source": {
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      "title": "Unleash: Clone-feature lets a user copy a feature from a project they cannot read"
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    "datePublished": "2026-09-22T20:21:35.069Z",
    "dateReserved": "2026-08-19T22:43:14.891Z",
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  "dataType": "CVE_RECORD",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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

GHSA-8XCJ-9HFR-FH9J

Summary

Details

PoC

Impact

CVE-2026-76910 (GCVE-0-2026-76910)

Tags

Sightings

Nomenclature

Related by attack behaviour