# CVE-2026-72590

## Summary

- **CVE ID:** CVE-2026-72590
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-93
- **Published:** Aug 10, 2026
- **Last Modified:** Aug 10, 2026

## Description

An OS command injection vulnerability in alseambusher/crontab-ui through 0.4.2 allows an unauthenticated remote attacker to inject arbitrary cron job entries by sending a crafted GET request to /crontab with URL-encoded newlines in the env_vars parameter. The handler appends the env_vars value directly to the crontab file string as '${envVars}\n' without stripping newline characters, enabling an attacker to insert arbitrary cron expressions that execute attacker-controlled commands.

## Affected Products

- alseambusher — crontab-ui (0)

## References

- [CNA](https://github.com/alseambusher/crontab-ui)
- [CNA](https://github.com/alseambusher/crontab-ui/blob/master/app.js)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.28%
- **EPSS Percentile:** 68.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._