CVE-2026-39401 MEDIUM

CVE-2026-39401: Privilege Escalation via update_event Job Output in Cronicle

Vendor Jhuckaby
Product Cronicle
Weakness CWE-862 · Missing authorization
Published April 7, 2026
Last update April 8, 2026

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 7, 2026 CVE published
April 8, 2026 Record updated