Vulnerability-Lookup

GHSA-PHG3-3G28-WQ9V

Vulnerability from github – Published: 2026-09-21 15:47 – Updated: 2026-09-21 15:47

Summary

Hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState

Details

Summary

Hatchet version v0.86.26 and below is vulnerable to OAuth state CSRF (login CSRF / account fixation).

The vulnerable code clears the session oauth_state_<integration> value to the empty string "" after a successful OAuth callback rather than removing the key, and the subsequent state-equality check then accepts an empty ?state= parameter on any later callback request — allowing an unauthenticated attacker to bind an already-authenticated victim's session cookie to an attacker-controlled OAuth identity (account takeover via login-CSRF).

Impact

Affected configurations: any deployment that has enabled at least one of auth.google.enabled, auth.github.enabled, or the Slack integration, and where the victim has completed at least one OAuth flow on that integration in the current session. Bug present on main HEAD and in every tagged release up to and including v0.86.26 (commit 243f41d9e1161e70d47dfc0a6509f1c4ddfc9c23).

Severity

7.1 (High)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "hatchet"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.91.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-61687"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1275",
      "CWE-287",
      "CWE-352",
      "CWE-384"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-21T15:47:01Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\n\nHatchet version v0.86.26 and below is vulnerable to OAuth state CSRF (login CSRF / account fixation). \n\nThe vulnerable code clears the session `oauth_state_\u003cintegration\u003e` value to the empty string `\"\"` after a successful OAuth callback rather than removing the key, and the subsequent state-equality check then accepts an empty `?state=` parameter on any later callback request \u2014 allowing an unauthenticated attacker to bind an already-authenticated victim\u0027s session cookie to an attacker-controlled OAuth identity (account takeover via login-CSRF). \n\n\n### Impact\n\nAffected configurations: any deployment that has enabled at least one of `auth.google.enabled`, `auth.github.enabled`, or the Slack integration, and where the victim has completed at least one OAuth flow on that integration in the current session. Bug present on `main` HEAD and in every tagged release up to and including v0.86.26 (commit `243f41d9e1161e70d47dfc0a6509f1c4ddfc9c23`).",
  "id": "GHSA-phg3-3g28-wq9v",
  "modified": "2026-09-21T15:47:01Z",
  "published": "2026-09-21T15:47:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-phg3-3g28-wq9v"
    },
    {
      "type": "WEB",
      "url": "https://github.com/hatchet-dev/hatchet/commit/f90464189ad642251e09412d0f99fde353036428"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/hatchet-dev/hatchet"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState"
}

CVE-2026-61687 (GCVE-0-2026-61687)

Vulnerability from cvelistv5 – Published: 2026-09-21 15:45 – Updated: 2026-09-21 20:45

Title

hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState

Summary

Hatchet is a platform for orchestrating background tasks, AI agents, and durable workflows at scale. Prior to 0.91.1, ValidateOAuthState clears the oauth_state_ session value to an empty string after a successful OAuth callback and later accepts an empty state parameter as equal, allowing an unauthenticated attacker to bind a victim's Hatchet session to an attacker-controlled OAuth identity. Exploitation requires the victim to have completed an OAuth flow in the current session and the deployment to enable auth.google.enabled, auth.github.enabled, or the Slack integration. This issue is fixed in version 0.91.1.

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-21 19:40 UTC

CWE

CWE-287 - Improper Authentication
CWE-352 - Cross-Site Request Forgery (CSRF)
CWE-384 - Session Fixation
CWE-1275 - Sensitive Cookie with Improper SameSite Attribute

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/hatchet-dev/hatchet/security/a…	x_refsource_CONFIRM
https://github.com/hatchet-dev/hatchet/commit/f90…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
hatchet-dev	hatchet	Affected: < 0.91.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-61687",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-21T19:40:30.611465Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-21T20:45:49.510Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "hatchet",
          "vendor": "hatchet-dev",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.91.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Hatchet is a platform for orchestrating background tasks, AI agents, and durable workflows at scale. Prior to 0.91.1, ValidateOAuthState clears the oauth_state_ session value to an empty string after a successful OAuth callback and later accepts an empty state parameter as equal, allowing an unauthenticated attacker to bind a victim\u0027s Hatchet session to an attacker-controlled OAuth identity. Exploitation requires the victim to have completed an OAuth flow in the current session and the deployment to enable auth.google.enabled, auth.github.enabled, or the Slack integration. This issue is fixed in version 0.91.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-287",
              "description": "CWE-287: Improper Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-352",
              "description": "CWE-352: Cross-Site Request Forgery (CSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-384",
              "description": "CWE-384: Session Fixation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-1275",
              "description": "CWE-1275: Sensitive Cookie with Improper SameSite Attribute",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-21T15:45:27.610Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-phg3-3g28-wq9v",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-phg3-3g28-wq9v"
        },
        {
          "name": "https://github.com/hatchet-dev/hatchet/commit/f90464189ad642251e09412d0f99fde353036428",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/hatchet-dev/hatchet/commit/f90464189ad642251e09412d0f99fde353036428"
        }
      ],
      "source": {
        "advisory": "GHSA-phg3-3g28-wq9v",
        "discovery": "UNKNOWN"
      },
      "title": "hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-61687",
    "datePublished": "2026-09-21T15:45:27.610Z",
    "dateReserved": "2026-07-10T18:36:58.849Z",
    "dateUpdated": "2026-09-21T20:45:49.510Z",
    "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.

Detection rules are retrieved from Rulezet.

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-PHG3-3G28-WQ9V

Summary

Impact

CVE-2026-61687 (GCVE-0-2026-61687)

Tags

Sightings

Nomenclature

Related by attack behaviour