What is CVE-2026-72590?

CVE-2026-72590 is a critical-severity vulnerability in Alseambusher Crontab-Ui, classified under CRLF Injection. CVSS score: 9.8/10. Published 2026-08-10.

How severe is CVE-2026-72590?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Alseambusher Crontab-Ui

CVE-2026-72590

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.

Vulnerability class: CRLF Injection

Published 2026-08-10 · last modified 2026-08-28.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.3th percentile), scored 2026-09-25.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.020 · change: +0.008

Affected products

Alseambusher Crontab-Ui — versions 0

Weakness classification (CWE)

CWE-93 — CRLF Injection

References

309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (third-party-advisory)
309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c (technical-description)

Frequently asked questions

What is CVE-2026-72590?: CVE-2026-72590 is a critical-severity vulnerability in Alseambusher Crontab-Ui, classified under CRLF Injection. CVSS score: 9.8/10. Published 2026-08-10.
How severe is CVE-2026-72590?: Critical severity. CVSS v3 base score is 9.8 out of 10.