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TI-2026-50940 Aliases CVE-2026-72702GHSA-9ccq-2jfg-qw33

Grav CMS before 2.0.16 Origin Validation Bypass via Referer

Priority HIGH 81CWE-346Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-346.

Summary

Grav CMS before 2.0.16 contains an origin validation bypass in the Uri::referrer() and Pages::referrerRoute() methods, which validate the Referer header using an unanchored string prefix match (str_starts_with($referrer, $base)) with no trailing delimiter. An attacker who controls a domain that begins with the victim site's origin (e.g. https://example.com.attacker.tld) can send a request with such a Referer to be treated as same-origin, bypassing the Referer-based origin check.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00149 4th percentileScored 2026-11-07
Fix Fixed grav (getgrav): 2.0.16getgrav/grav (Packagist): 2.0.16

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
getgravgravbefore 2.0.162.0.16Patch availableCNA
—getgrav/grav (Packagist)before 2.0.162.0.16Patch availableGHSA-9ccq-2jfg-qw33
  • grav Vendorgetgrav Affected before 2.0.16 Fixed in 2.0.16 Patch available CNA
  • getgrav/grav (Packagist) Vendor— Affected before 2.0.16 Fixed in 2.0.16 Patch available GHSA-9ccq-2jfg-qw33

Remediation

  • Fix · CNA grav (getgrav) Fixed in 2.0.16
  • Fix · GHSA-9ccq-2jfg-qw33 getgrav/grav (Packagist) Fixed in 2.0.16 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    getgrav grav 2.0.16

    8 records Highest priority Priority HIGH 4 HIGH, 3 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-53682 Grav before 2.0.16 Information Disclosure via Twig SandboxPriority HIGH 77
    • TI-2026-50934 Grav CMS before 2.0.16 Symlink Following via createLockFilePriority HIGH 72
    • TI-2026-53675 Grav before 2.0.16 Information Disclosure via offsetGetPriority HIGH 71
    Show all 8 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-72702
  2. 2026-10-03 Alias added: GHSA-9ccq-2jfg-qw33

References

Advisory 2

Other 1

  • TI-2026-30893 Grav: Privilege Escalation via Missing Server-Side Validation of groups/access CVSS 3.1CRITICAL 9.4
  • TI-2025-28971 Cross Site Scripting vulnerability in grav v.1.7.48 and before allows an attacker to… CVSS 3.1CRITICAL 9.8
  • TI-2021-04523 Unauthenticated Arbitrary YAML Write/Update leads to Code Execution CVSS 3.1CRITICAL 9.8
  • TI-2026-46446 Grav before 2.0.7 Remote Code Execution via Blueprint dynamicData CVSS 4.0CRITICAL 9.3
  • TI-2021-22428 GravCMS 1.10.7 - Arbitrary YAML Write/Update (Unauthenticated) (2) CVSS 4.0CRITICAL 9.3
  • TI-2025-41064 In grav <1.7.49.5, a SSRF (Server-Side Request Forgery) vector may be triggered via Twig… CVSS 3.1CRITICAL 9.1
See all 228 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences