CVE-2026-56709

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.

CVSS Vector

References

• https://github.com/getgrav/grav/security/advisories/GHSA-69vf-mjxw-x79j
• https://www.vulncheck.com/advisories/grav-before-host-header-injection-via-sendinvitationemail