CVE-2026-56709
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Aug 25, 2026
Vendor
unknown
Description
Grav before 3.9.2 fails to validate untrusted Host headers in the sendInvitationEmail() function when constructing token-bearing invitation links. Attackers can manipulate the Host header to poison invitation links and redirect users to attacker-controlled domains, bypassing the require_trusted_host protection which only covers password reset flows.