Vulnerability · Published Sep 21, 2026 · Assigned by GitHub_M
CVE-2026-61687hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState
High 7.1
In plain English
A high-severity improper authentication in hatchet from hatchet-dev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/hatchet-dev/hatchet | 0.91.1 | GHSA-phg3-3g28-wq9v |
| Go | github.com/hatchet-dev/hatchet | 0.91.2 | GO-2026-6535 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| hatchet-dev | hatchet | < 0.91.1 |
Weakness: CWE-287, CWE-352, CWE-384, CWE-1275 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N