What is GHSA-6c2c-797q-5r9x?

GHSA-6c2c-797q-5r9x is a security advisory published by GitHub Security Advisories with High severity. Grav before 3.9.2 fails to validate untrusted Host headers in the sendInvitationEmail() function...

Which CVE IDs does GHSA-6c2c-797q-5r9x cover?

GHSA-6c2c-797q-5r9x covers the following CVE IDs: CVE-2026-56709. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-6c2c-797q-5r9x?

GHSA-6c2c-797q-5r9x has a CVSS v3 base score of 7.5, published by GitHub Security Advisories.

GHSA-6c2c-797q-5r9xHighCVSS 7.5

Grav before 3.9.2 fails to validate untrusted Host headers in the sendInvitationEmail() function...

Vendor

GitHub Security Advisories

Published

August 25, 2026

Last Modified

August 25, 2026

🔗 CVE IDs covered (1)

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.

🔗 References (4)

https://github.com/getgrav/grav/security/advisories/GHSA-69vf-mjxw-x79j
https://nvd.nist.gov/vuln/detail/CVE-2026-56709
https://www.vulncheck.com/advisories/grav-before-host-header-injection-via-sendinvitationemail
https://github.com/advisories/GHSA-6c2c-797q-5r9x