CVE-2026-56709CWE-350

CVE-2026-56709

High · published August 25, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
17.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
8.7 · 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
EPSS
0.00256 · 17.1th percentile
Weakness
CWE-350 · Reliance on Reverse DNS Resolution for a Security-Critical Action
Published
2026-08-25T06:16Z
References (2)
https://github.com/getgrav/grav/security/advisories/GHSA-69vf-mjxw-x79j · [email protected]https://www.vulncheck.com/advisories/grav-before-host-header-injection-via-sendinvitationemail · [email protected]
EPSS history
Timeline
  • 26 AUG 08:15Z
    EPSS moved — → 0%
    epss
  • 25 AUG 01:30Z
    Grav before 3.9.2 Host Header Injection via sendInvitationEmail
    cvelistv5