CVE-2026-55562
CriticalCVSS 9.0Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
Cronicle prior to 0.9.119 concatenates the attacker-controlled item.user.full_name value into HTML in the administrator Activity Log (htdocs/js/pages/admin/Activity.js) without applying encode_entities and inserts the result through this.div.html. The bundled pixl-server-user input filter can be bypassed by a tag containing a line break because its regular expression does not match newlines. An authenticated non-administrator can update their own name through /api/user/update, and when free_accounts is enabled an anonymous attacker can plant the name during self-registration. The stored name executes script in an administrator's session when the Activity Log is opened, enabling administrator takeover and subsequent command execution. This issue is fixed in version 0.9.119.
Risk Assessment
An attacker can take over a Cronicle administrator account and execute commands with privileged permissions, leading to full compromise of the system and its tasks.
Recommendation
Upgrade Cronicle to version 0.9.119 or later and consider disabling the free_accounts feature until the fix is deployed.
Other vulnerabilities in Cronicle
See all- CVE-2026-58255High
In Cronicle 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.
- CVE-2026-39401Medium
Cronicle before version 0.9.111 has a vulnerability where child processes can modify the parent event's configuration via the update_event key in JSON output without any authorization check. This allows a low-privilege user who can create and run events to change any event property, including webhook URLs and notification emails.
- CVE-2026-39400Medium
Cronicle, a multi-server task scheduler, prior to version 0.9.111 allows non-admin users to inject arbitrary JavaScript through job output fields. The server stores data without sanitization, and the client renders it via innerHTML on the Job Details page.
Original NVD description (English source)
Cronicle is a multi-server task scheduler and runner, with a web based front-end UI. Prior to 0.9.119, the administrator Activity Log in htdocs/js/pages/admin/Activity.js concatenates the attacker-controlled item.user.full_name value into HTML without applying encode_entities and inserts the result through this.div.html. The bundled pixl-server-user input filter can be bypassed by a tag containing a line break because its regular expression does not match newlines. An authenticated non-administrator can update the attacker's own name through /api/user/update using a valid session and current password; when free_accounts is enabled, an anonymous attacker can instead plant the name during self-registration. The stored name executes script in an administrator's session when the Activity Log is opened, enabling administrator takeover and subsequent command execution through privileged Cronicle features. This issue is fixed in version 0.9.119.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS