Vulnerability-Lookup

GHSA-P953-2G5P-33C5

Vulnerability from github – Published: 2026-05-13 00:48 – Updated: 2026-05-13 00:48

Details

Heym before 0.0.21 contains an authorization bypass vulnerability in workflow execution that allows authenticated users to execute arbitrary workflows by referencing victim workflow UUIDs without proper access validation. Attackers can create workflows with execute nodes or agent subWorkflowIds pointing to victim workflow UUIDs to load and execute those workflows under attacker-controlled execution paths, exposing victim workflow outputs and triggering workflow nodes with unintended side effects.

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L

7.6 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45226"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-12T22:16:38Z",
    "severity": "HIGH"
  },
  "details": "Heym before 0.0.21 contains an authorization bypass vulnerability in workflow execution that allows authenticated users to execute arbitrary workflows by referencing victim workflow UUIDs without proper access validation. Attackers can create workflows with execute nodes or agent subWorkflowIds pointing to victim workflow UUIDs to load and execute those workflows under attacker-controlled execution paths, exposing victim workflow outputs and triggering workflow nodes with unintended side effects.",
  "id": "GHSA-p953-2g5p-33c5",
  "modified": "2026-05-13T00:48:14Z",
  "published": "2026-05-13T00:48:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45226"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/pull/93"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/commit/3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/heymrun/heym/releases/tag/v0.0.21"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/heym-authorization-bypass-in-workflow-execution"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-45226 (GCVE-0-2026-45226)

Vulnerability from cvelistv5 – Published: 2026-05-12 21:17 – Updated: 2026-07-14 20:01 X_Open Source

Title

Heym < 0.0.21 Authorization Bypass in Workflow Execution

Summary

Severity

7.6 (High)


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

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-13 15:04 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://github.com/heymrun/heym/releases/tag/v0.0.21	release-notes
https://github.com/heymrun/heym/pull/93	issue-tracking
https://github.com/heymrun/heym/commit/3ae3ef6a7d…	patch
https://www.vulncheck.com/advisories/heym-authori…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
heymrun	heym	Affected: 0 , < 0.0.21 (semver) Unaffected: 3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8 (git)

Date Public

2026-05-09 00:00

Credits

Chia Min Jun Lennon

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45226",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-13T15:04:16.201985Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-13T15:37:08.709Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "packageURL": "pkg:github/heymrun/heym",
          "product": "heym",
          "repo": "https://github.com/heymrun/heym",
          "vendor": "heymrun",
          "versions": [
            {
              "lessThan": "0.0.21",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8",
              "versionType": "git"
            }
          ]
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      ],
      "credits": [
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          "type": "finder",
          "value": "Chia Min Jun Lennon"
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      "datePublic": "2026-05-09T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Heym before 0.0.21 contains an authorization bypass vulnerability in workflow execution that allows authenticated users to execute arbitrary workflows by referencing victim workflow UUIDs without proper access validation. Attackers can create workflows with execute nodes or agent subWorkflowIds pointing to victim workflow UUIDs to load and execute those workflows under attacker-controlled execution paths, exposing victim workflow outputs and triggering workflow nodes with unintended side effects."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.6,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
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            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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        {
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            "attackComplexity": "HIGH",
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            "availabilityImpact": "LOW",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L",
            "version": "3.1"
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          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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      "problemTypes": [
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          "descriptions": [
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              "description": "Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-14T20:01:18.938Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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      },
      "references": [
        {
          "tags": [
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          ],
          "url": "https://github.com/heymrun/heym/releases/tag/v0.0.21"
        },
        {
          "tags": [
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          ],
          "url": "https://github.com/heymrun/heym/pull/93"
        },
        {
          "tags": [
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          "url": "https://github.com/heymrun/heym/commit/3ae3ef6a7d3609da0e910f9ed6b81e99a1661ac8"
        },
        {
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          "url": "https://www.vulncheck.com/advisories/heym-authorization-bypass-in-workflow-execution"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
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        "x_open-source"
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    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-45226",
    "datePublished": "2026-05-12T21:17:10.526Z",
    "dateReserved": "2026-05-11T14:14:49.611Z",
    "dateUpdated": "2026-07-14T20:01:18.938Z",
    "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.

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.

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Action not permitted

GHSA-P953-2G5P-33C5

CVE-2026-45226 (GCVE-0-2026-45226)

Tags

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