GHSA-9w42-v8cj-68gq: Cronicle: Privilege Escalation via Arbitrary Environment Variable Injection through Event Params (Incomplete Fix for CVE-2026-39401)

Cronicle is a multi-server task scheduler and runner, with a web based front-end UI. Prior to 0.9.124, an authenticated non-admin with runevents, createevents, or editevents privilege can supply undeclared keys in event params through apicreateevent, apiupdateevent, or apirunevent. lib/api.js and lib/api/event.js validate the parameter object without restricting its keys, and lib/job.js uppercases those keys and applies them to the child process environment after administrator-defined plugin variables. A key that collides with a security-sensitive environment variable can therefore override the plugin execution context and may cause privilege escalation, arbitrary code execution, data access, or service disruption depending on the plugin and runtime. This issue is fixed in version 0.9.124.