# CVE-2026-56709

## Summary

- **CVE ID:** CVE-2026-56709
- **Severity:** HIGH
- **CVSS Score:** 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)
- **CWE:** CWE-350
- **Published:** Aug 25, 2026
- **Last Modified:** Aug 26, 2026

## 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.

## Affected Products

- getgrav — grav (0)
- getgrav — grav (3.9.2)

## References

- [CNA](https://github.com/getgrav/grav/security/advisories/GHSA-69vf-mjxw-x79j)
- [CNA](https://www.vulncheck.com/advisories/grav-before-host-header-injection-via-sendinvitationemail)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._