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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (35.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-69vf-mjxw-x79j (vendor-advisory)
- www.vulncheck.com/advisories/grav-before-host-header-injection-via-sendinvitati… (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.