What is CVE-2026-56709?

CVE-2026-56709 is a high-severity vulnerability in Getgrav Grav, classified under CWE-350. CVSS score: 7.5/10. Published 2026-08-25.

How severe is CVE-2026-56709?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Getgrav Grav

CVE-2026-56709

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 v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Getgrav Grav

Weakness classification (CWE)

CWE-350

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-56709?: CVE-2026-56709 is a high-severity vulnerability in Getgrav Grav, classified under CWE-350. CVSS score: 7.5/10. Published 2026-08-25.
How severe is CVE-2026-56709?: High severity. CVSS v3 base score is 7.5 out of 10.