XSS in Cronicle
CVE-2026-39400
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.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (6.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Cronicle
- Jhuckaby Cronicle — versions < 0.9.111
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-39400?
- CVE-2026-39400 is a medium-severity vulnerability in Cronicle, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-04-07.
- How severe is CVE-2026-39400?
- Medium severity. CVSS v3 base score is 6.1 out of 10.