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CVE-2026-63342— Hatchet: Cross-Tenant Durable Task Event Log Disclosure via Missing Authorization Check

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, api-contracts/openapi/paths/v1/workflow-runs/workflow_run.yaml defines the GET /api/v1/stable/durable-tasks/{durable-task} endpoint implemente

CVSS 6.3 · Medium EPSS 0.20% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
hatchet-dev hatchet < 0.91.1 affected
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I. Basic Information for CVE-2026-63342

Vulnerability Information

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Vulnerability Title
Hatchet: Cross-Tenant Durable Task Event Log Disclosure via Missing Authorization Check
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, api-contracts/openapi/paths/v1/workflow-runs/workflow_run.yaml defines the GET /api/v1/stable/durable-tasks/{durable-task} endpoint implemented by listDurableEventLog without requiring the target tenant as a parent resource, allowing an authenticated user who obtains another tenant's durable task UUID to read that task's event log. Disclosed data can include task display names, workflow identifiers, user messages, wait conditions, branching logic, and timing information. This issue is fixed in version 0.91.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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-2026-63342

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III. Intelligence Information for CVE-2026-63342

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Patches & Fixes for CVE-2026-63342 (1)

Other References for CVE-2026-63342 (1)

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

CVE-2026-61687 7.1 HIGH hatchet - Unauthenticated OAuth state CSRF / login-CSRF via empty-state collision in Valid
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-863

V. Comments for CVE-2026-63342

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