Vulnerability details
CVE-2026-56709
getgrav grav
Grav before 3.9.2 Host Header Injection via sendInvitationEmail
CVSS 4.0
8.7High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.7High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| getgrav | grav | v < 3.9.2 | CVEProject cvelistV5 (CNA) |
References and advisories
2
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Details
- Published
- 2026-08-25
- Last updated
- 2026-08-26
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
0.43%
Probability of exploitation in 30 days
37.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-350Reliance on Reverse DNS Resolution for a Security-Critical Action