CVE-2026-61687 Details
Description
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.
A Cross-Site Request Forgery (CSRF) vulnerability has been identified in Hatchet, a workflow orchestration platform, in versions through v0.86.26. The issue arises in the OAuth state validation process, where the application incorrectly handles the state parameter after an OAuth callback. Instead of removing the session value, it is cleared to an empty string. This flaw allows an unauthenticated attacker to exploit the session by binding it to an attacker-controlled OAuth identity, potentially leading to account takeover. Exploitation requires the victim to have completed an OAuth flow in the current session, and the deployment must have Google or GitHub authentication enabled, or the Slack integration active.
Users are advised to update to Hatchet version v0.91.2 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 21, 2026CISA-ADP
Assessed Sep 21, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/hatchet-dev/hatchet/commit/f90464189ad642251e09412d0f99fde353036428 | [email protected] | Source CodeVendor |
| https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-phg3-3g28-wq9v | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1275 | Sensitive Cookie with Improper SameSite Attribute | [email protected] |
| CWE-287 | Improper Authentication | [email protected] |
| CWE-352 | Cross-Site Request Forgery (CSRF) | [email protected] |
| CWE-384 | Session Fixation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Hatchet | <= 0.86.26 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 21, 2026 | CVE Modified | CISA-ADP |
| Sep 21, 2026 | New CVE Received | [email protected] |