Vulnerability-Lookup

GHSA-H6C8-CWW8-35HF

Vulnerability from github – Published: 2026-03-26 17:21 – Updated: 2026-03-27 21:30

Summary

OpenFGA has an Authorization Bypass through cached keys

Details

Description

In OpenFGA, under specific conditions, models using conditions with caching enabled can result in two different check requests producing the same cache key. This can result in OpenFGA reusing an earlier cached result for a different request.

Am I Affected?

Users are affected if the following preconditions are met: 1. The model has relations which rely on condition evaluation. 1. Caching is enabled.

Fix

Upgrade to OpenFGA v1.13.1.

Acknowledgement

OpenFGA would like to thank @Amemoyoi for the discovery and responsible disclosure.

Severity

5.8 (Medium)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openfga/openfga"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.13.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33729"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1289",
      "CWE-20",
      "CWE-345"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-26T17:21:50Z",
    "nvd_published_at": "2026-03-27T01:16:20Z",
    "severity": "MODERATE"
  },
  "details": "### Description\nIn OpenFGA, under specific conditions, models using conditions with caching enabled can result in two different check requests producing the same cache key. This can result in OpenFGA reusing an earlier cached result for a different request.\n\n### Am I Affected?\nUsers are affected if the following preconditions are met:\n1. The model has relations which rely on condition evaluation.\n1. Caching is enabled.\n\n### Fix\nUpgrade to OpenFGA v1.13.1.\n\n### Acknowledgement\nOpenFGA would like to thank @Amemoyoi for the discovery and responsible disclosure.",
  "id": "GHSA-h6c8-cww8-35hf",
  "modified": "2026-03-27T21:30:41Z",
  "published": "2026-03-26T17:21:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openfga/openfga/security/advisories/GHSA-h6c8-cww8-35hf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33729"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openfga/openfga/commit/049b50ccd2cc7e163bd897f3d17a7b859ad146f8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openfga/openfga"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openfga/openfga/releases/tag/v1.13.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OpenFGA has an Authorization Bypass through cached keys"
}

CVE-2026-33729 (GCVE-0-2026-33729)

Vulnerability from cvelistv5 – Published: 2026-03-27 00:27 – Updated: 2026-03-30 11:53

Title

OpenFGA has an Authorization Bypass through cached keys

Summary

OpenFGA is a high-performance and flexible authorization/permission engine built for developers and inspired by Google Zanzibar. In versions prior to 1.13.1, under specific conditions, models using conditions with caching enabled can result in two different check requests producing the same cache key. This can result in OpenFGA reusing an earlier cached result for a different request. Users are affected if the model has relations which rely on condition evaluation andncaching is enabled. OpenFGA v1.13.1 contains a patch.

Severity

5.8 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-30 11:52 UTC

CWE

CWE-20 - Improper Input Validation
CWE-345 - Insufficient Verification of Data Authenticity
CWE-1289 - Improper Validation of Unsafe Equivalence in Input

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7765 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/openfga/openfga/security/advis…	x_refsource_CONFIRM
https://github.com/openfga/openfga/commit/049b50c…	x_refsource_MISC
https://github.com/openfga/openfga/releases/tag/v1.13.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
openfga	openfga	Affected: < 1.13.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33729",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-30T11:52:54.486868Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-30T11:53:10.107Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "openfga",
          "vendor": "openfga",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.13.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "OpenFGA is a high-performance and flexible authorization/permission engine built for developers and inspired by Google Zanzibar. In versions prior to 1.13.1, under specific conditions, models using conditions with caching enabled can result in two different check requests producing the same cache key. This can result in OpenFGA reusing an earlier cached result for a different request. Users are affected if the model has relations which rely on condition evaluation andncaching is enabled. OpenFGA v1.13.1 contains a patch."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20: Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "CWE-345: Insufficient Verification of Data Authenticity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-1289",
              "description": "CWE-1289: Improper Validation of Unsafe Equivalence in Input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-27T00:27:40.726Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/openfga/openfga/security/advisories/GHSA-h6c8-cww8-35hf",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/openfga/openfga/security/advisories/GHSA-h6c8-cww8-35hf"
        },
        {
          "name": "https://github.com/openfga/openfga/commit/049b50ccd2cc7e163bd897f3d17a7b859ad146f8",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openfga/openfga/commit/049b50ccd2cc7e163bd897f3d17a7b859ad146f8"
        },
        {
          "name": "https://github.com/openfga/openfga/releases/tag/v1.13.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openfga/openfga/releases/tag/v1.13.1"
        }
      ],
      "source": {
        "advisory": "GHSA-h6c8-cww8-35hf",
        "discovery": "UNKNOWN"
      },
      "title": "OpenFGA has an Authorization Bypass through cached keys"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33729",
    "datePublished": "2026-03-27T00:27:40.726Z",
    "dateReserved": "2026-03-23T17:34:57.560Z",
    "dateUpdated": "2026-03-30T11:53:10.107Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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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.
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