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
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (15.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 15.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Cronicle
- Jhuckaby Cronicle — versions < 0.9.111
Weakness classification (CWE)
References
- github.com/jhuckaby/Cronicle/security/advisories/GHSA-5j3v-cq96-xw6v (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-39401?
- CVE-2026-39401 is a medium-severity vulnerability in Cronicle, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-04-07.
- How severe is CVE-2026-39401?
- Medium severity. CVSS v3 base score is 5.4 out of 10.