CVE-2026-56709

HIGH 7.5

Grav before 3.9.2 Host Header Injection via sendInvitationEmail

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-350
Vendor	getgrav
Product	grav
Published	Aug 25, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

getgrav / grav

0 < 3.9.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 alham-rizvi