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CVE-2026-61687— hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState

Quick assessment

Affected
hatchet-dev hatchet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 7.1 · High EPSS 0.12% · P2

Affected Version Matrix 1

VendorProduct Version RangeStatus
hatchet-dev hatchet < 0.91.1 affected
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I. Basic Information for CVE-2026-61687

Vulnerability Information

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Vulnerability Title
hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in ValidateOAuthState
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
hatchet-dev hatchet < 0.91.1 -

II. Public POCs for CVE-2026-61687

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III. Intelligence Information for CVE-2026-61687

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Patches & Fixes for CVE-2026-61687 (1)

Other References for CVE-2026-61687 (1)

Same Patch Batch · hatchet-dev · 2026-09-21 · 5 CVEs total

CVE-2026-63342 6.3 MEDIUM Hatchet: Cross-Tenant Durable Task Event Log Disclosure via Missing Authorization Check
CVE-2026-88978 4.3 MEDIUM Hatchet DurableTask WorkerStatus gRPC resolves caller-supplied durable-task UUIDs via List
CVE-2026-61681 4.1 MEDIUM Hatchet: SSRF via Unsigned UnsubscribeURL in SNS UnsubscribeConfirmation Handler
CVE-2026-84298 3.1 LOW Hatchet: Cross-tenant durable callback payload disclosure in Hatchet V1 Dispatcher

IV. Related Vulnerabilities

Same product: hatchet
Same vendor: hatchet-dev
Same weakness: CWE-287

V. Comments for CVE-2026-61687

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