Auth bypass in Cronicle

CVE-2026-39401

Cronicle is a multi-server task scheduler and runner, with a web based front-end UI. Prior to 0.9.111, jb child processes can include an update_event key in their JSON output. The server applies this directly to the parent event's stored configuration without any authorization check. A low-privilege user who can create and run events can modify any event property, including webhook URLs and notification emails. This vulnerability is fixed in 0.9.111.

Vulnerability class: Broken Access Control

EPSS: 0.002 (7.7th percentile) — read the EPSS interpretation.