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Back to active CVEs
High · CVSS 8.7CVE-2026-56709

Grav before 3.9.2 Host Header Injection via sendInvitationEmailCVE-2026-56709

Answer in brief

CVE-2026-56709 records a High severity (CVSS 8.7) vulnerability in Grav before 3.9.2 Host Header Injection via sendInvitationEmail. The current sources do not mark it as known exploited. The current feed maps getgrav/grav (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 31, 2026Source checked Oct 9, 2026First seen by HOL Aug 25, 2026Material review Aug 31, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps getgrav/grav (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
getgrav/gravgeneric>=0 <3.9.23.9.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for getgrav/grav.
  2. 2Review the reported fix. Update getgrav/grav to 3.9.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Aug 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 31, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 25, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Unauthenticated JSON API Authorization Bypass Vulnerability in TP-Link Tapo C325WBSame generic ecosystem
  • Unauthenticated RTSP Tunnel Denial-of-Service Vulnerability in TP-Link Tapo C325WBSame generic ecosystem
  • Predictable Media Stream Pre-Shared Key Vulnerability in TP-Link Tapo C325WBSame generic ecosystem
  • Eog: eog: arbitrary code execution via heap buffer overflow in png metadata readerSame generic ecosystem
  • fast-jwt treats raw public JWK JSON as an HMAC secret, enabling HS256 token forgerySame generic ecosystem
  • Hazelcast: Authorization bypass in IMap Predicates APISame generic ecosystem

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-350
Source
CVE List V5
Source checked
Oct 9, 2026
References
2 linked sources
Open source record