CVE-2026-72590: alseambusher crontab-ui - Unauthenticated RCE via Newline Injection in env_vars Parameter

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-10 · updated 2026-10-24
Weakness: CWE-93

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.

Affected products

alseambusher crontab-ui: through 0.4.2

References

https://github.com/alseambusher/crontab-ui
https://github.com/alseambusher/crontab-ui/blob/master/app.js

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