alseambusher crontab-ui up to 0.4.2 crontab.js makeCommand hook os command injection

Summaryinfo

A vulnerability identified as critical has been detected in alseambusher crontab-ui up to 0.4.2. This affects the function makeCommand of the file crontab.js. Performing a manipulation of the argument hook results in os command injection. This vulnerability is reported as CVE-2026-72589. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in alseambusher crontab-ui up to 0.4.2. This affects the function makeCommand of the file crontab.js. The manipulation of the argument hook with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An OS command injection vulnerability in alseambusher/crontab-ui through 0.4.2 allows an unauthenticated remote attacker to execute arbitrary system commands by importing a crafted crontab database file. The POST /import endpoint accepts arbitrary .db files and overwrites the application database without validation. The hook field value is embedded directly into a shell command by crontab.js makeCommand() without sanitization, so a malicious hook value in the imported file results in command execution on the next cron execution cycle.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-72589 since 08/10/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/10/2026). MITRE ATT&CK project uses the attack technique T1202 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• alseambusher

Name

• crontab-ui

Version

• 0.4.0
• 0.4.1
• 0.4.2

CPE 2.3info

• 🔒
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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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