CVE-2026-55791: cms >= 5.0.0-RC1, < 5.10.0, >= 4.0.0-RC1, < 4.18.0

Affected technology

cms · >= 5.0.0-RC1, < 5.10.0, >= 4.0.0-RC1, < 4.18.0
craftcms

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · No privileges required · No user interaction required

What an attacker can do

An attacker can poison the Host or X-Forwarded-Host header to manipulate the application’s $baseUrl. Vendor/CNA’s CVSS 4.0 assessment (base score 6.9/10) rates confidentiality impact as low; integrity and availability impact as none.