CVE-2026-39400 Stored XSS via Job HTML/Table Output in Cronicle
A non-admin user can inject arbitrary JavaScript via job output fields, leading to stored XSS and potential account takeover in Cronicle.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39400?
CVE-2026-39400 is a medium-severity cross-site scripting vulnerability in jhuckaby Cronicle, published on 7 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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 create_events and run_events 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-39400?
It affects 1 product.
Products include Cronicle Cronicle.
How do I fix CVE-2026-39400?
No fix has been published for CVE-2026-39400 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-39400 being exploited?
There is no known exploitation of CVE-2026-39400 in the wild and no public exploit code.
Other vulnerabilities in jhuckaby Cronicle
Sources
Also known as GHSA-36q6-pwxv-j545.