Vulnerabilities CVE-2026-56709

CVE-2026-56709

High

Open

TLP:CLEAR

Grav before 3.9.2 Host Header Injection via sendInvitationEmail

NVD CVE.org

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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.

Details

CVSS Score: 8.7
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Confidence: 90%
Published: Aug 25, 2026
Last Modified: Aug 25, 2026

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