jhuckaby Cronicle up to 0.9.120 Event Validation lib/api.js requireValidEventData uid/gid injection

Summaryinfo

A vulnerability, which was classified as critical, was found in jhuckaby Cronicle up to 0.9.120. This impacts the function requireValidEventData of the file lib/api.js of the component Event Validation. The manipulation of the argument uid/gid results in injection. This vulnerability is known as CVE-2026-58255. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in jhuckaby Cronicle up to 0.9.120. Affected is the function requireValidEventData of the file lib/api.js of the component Event Validation. The manipulation of the argument uid/gid with an unknown input leads to a injection vulnerability. CWE is classifying the issue as CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Cronicle is a multi-server task scheduler and runner, with a web based front-end UI. Prior to 0.9.121, a non-administrator user or scoped API key with `create_events` and `run_events` privileges can inject top-level `uid` and `gid` fields through `/api/app/create_event` or `/api/app/update_event`. In `lib/api.js`, `requireValidEventData` uses `validateOptionalParams` as a partial allow-list that silently passes unknown keys, storing the injected fields verbatim. In `lib/job.js`, `launchJob` copies the whole event into the job, and a plugin `uid` overrides the event `uid` only when the plugin defines one. The default `shellplug` and `urlplug` plugins do not define a `uid`, so the event-controlled identity survives into child-process launch. On a root-daemon installation, this lets a low-privileged user run jobs as arbitrary users, including root, bypassing the otherwise administrator-only run-as-user control. This API-side event injection is distinct from the job-output `uid`/`gid` injection addressed by CVE-2026-39401. This issue is fixed in version 0.9.121.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-58255 since 06/29/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1055 by the MITRE ATT&CK project.

Upgrading to version 0.9.121 eliminates this vulnerability.

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Productinfo

Vendor

• jhuckaby

Name

• Cronicle

Version

• 0.9.120

Website

• Product: https://github.com/jhuckaby/Cronicle/

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