CVE-2026-72590Network attack vector

Unauthenticated command execution via cron newline injection

Published Aug 10, 2026 · Updated Aug 10, 2026

OS command injection in alseambusher crontab-ui through 0.4.2 allows remote attackers to execute commands through crafted env_vars input. The GET /crontab handler passes env_vars to set_crontab, which inserts it verbatim before writing and installing the generated crontab file. Installations without BASIC_AUTH_USER and BASIC_AUTH_PWD expose the route without authentication; injected entries execute as the cron account.

CVSS severity9.8
Critical
EPSS probability1.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in alseambusher crontab-ui through 0.4.2 allows remote attackers to execute commands through crafted env_vars input. The GET /crontab handler passes env_vars to set_crontab, which inserts it verbatim before writing and installing the generated crontab file. Installations without BASIC_AUTH_USER and BASIC_AUTH_PWD expose the route without authentication; injected entries execute as the cron account.

The record

CVE
CVE-2026-72590
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
alseambusher
Product
crontab-ui
Classifications
CWE-93, T1053.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

alseambusher · crontab-uiversion=0 <=0.4.2

Published CVSS scores

9.8TuranSecCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
T1053.003Scheduled Task/Job: Cron

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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