CVE-2026-56709
Grav before 3.9.2 Host Header Injection via sendInvitationEmail
- State
- Published
- Severity
- 8.7 High
- Published
- Aug 25, 2026
- Updated
- Aug 26, 2026
- Reserved
- Jun 22, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-350 Reliance on Reverse DNS Resolution for a Security-Critical Action
Affected Products
| Product | Versions |
|---|---|
gravgetgrav |
|
References
- GitHub Security Advisory (GHSA-69vf-mjxw-x79j)vendor-advisory
- VulnCheck Advisory: Grav before 3.9.2 Host Header Injection via sendInvitationEmailthird-party-advisory
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