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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Getgrav Subscribe
Grav Subscribe

No data.

No data.

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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

Tue, 25 Aug 2026 02:00:00 +0000

Type Values Removed Values Added
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.
Title Grav before 3.9.2 Host Header Injection via sendInvitationEmail
First Time appeared Getgrav
Getgrav grav
Weaknesses CWE-350
CPEs cpe:2.3:a:getgrav:grav:*:*:*:*:*:*:*:*
Vendors & Products Getgrav
Getgrav grav
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 8.7, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-25T01:30:10.057Z

Reserved: 2026-06-22T18:48:27.060Z

Link: CVE-2026-56709

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-25T02:16:42.930

Modified: 2026-08-25T02:16:42.930

Link: CVE-2026-56709

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses