CVE-2026-39400: Stored XSS via Job HTML/Table Output in Cronicle
Cronicle is a multi-server task scheduler and runner, with a web based front-end UI. Prior to 0.9.111, a non-admin user with createevents and runevents privileges can inject arbitrary JavaScript through job output fields (html.content, html.title, table.header, table.rows, table.caption). The server stores this data without sanitization, and the client renders it via innerHTML on the Job Details page. This vulnerability is fixed in 0.9.111.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Cronicleto a version that resolves this vulnerability.Fixed in 0.9.111
Event History
Frequently Asked Questions
What is the severity of CVE-2026-39400?
CVE-2026-39400 has not been assigned a CVSS score, but it is a Stored XSS vulnerability that can lead to serious security risks.
How do I fix CVE-2026-39400?
To fix CVE-2026-39400, update to Cronicle version 0.9.111 or later.
What type of vulnerability is CVE-2026-39400?
CVE-2026-39400 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the job output fields.
Who is affected by CVE-2026-39400?
Any non-admin user with create_events and run_events privileges in Cronicle versions prior to 0.9.111 is affected by CVE-2026-39400.
What can attackers do with CVE-2026-39400?
Attackers exploiting CVE-2026-39400 can inject arbitrary JavaScript into job output fields, potentially compromising user sessions.