CVE-2026-63342

MEDIUM 6.3

Hatchet: Cross-Tenant Durable Task Event Log Disclosure via Missing Authorization Check

CVSS Score

6.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-863
Vendor	hatchet-dev
Product	hatchet
Published	Sep 21, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

hatchet-dev / hatchet

< 0.91.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/hatchet-dev/hatchet/security/advisories/GHSA-g26x-m427-f48f github.com: https://github.com/hatchet-dev/hatchet/commit/06c1fe43543e853ea98ecc2e6a575e2b8310bbeb