What’s Vulnerable › Vulnerabilities

CVE-2026-72574: picocms Pico - Host Header Injection Enables Script Source Hijacking

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% 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-644

Description

A host header injection vulnerability in picocms/Pico through 2.1.4 allows an unauthenticated remote attacker to control the origin of JavaScript and CSS assets loaded by the default theme. When base_url is unset (the default), Pico::getBaseUrl in lib/Pico.php builds the base URL from unvalidated Host, X-Forwarded-Host, X-Forwarded-Proto, and X-Forwarded-Port request headers.

Affected products

• picocms Pico: through 2.1.4

References

• https://github.com/picocms/Pico
• https://github.com/picocms/Pico/blob/master/lib/Pico.php
• https://picocms.org

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