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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61687
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-21 16:17:09 UTC
Updated2026-09-24 21:25:27 UTC
DescriptionHatchet 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

EPSS: 0.001710000 probability, percentile 0.057630000 (date 2026-09-25)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Hatchet-dev Hatchet affected < 0.91.1 Not specified

References

ReferenceSourceLinkTags
github.com/hatchet-dev/hatchet/security/advisories/GHSA-phg3-3g28-wq9v [email protected] github.com
github.com/hatchet-dev/hatchet/commit/f90464189ad642251e09412d0f99fde353... [email protected] github.com
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