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TI-2026-53073 Aliases CVE-2026-75827GHSA-f8wv-xp27-6gq7

Grav before 2.0.15 Arbitrary File Write via error_log

Priority HIGH 75CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
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-94.

Summary

Grav before 2.0.15 contains an arbitrary file write vulnerability in the Blueprint dynamic-data bare-function validation that uses an incomplete denylist instead of a positive allowlist. Attackers with page-edit or blueprint-config access can invoke the error_log function through a data directive to append PHP payloads to web-accessible files, achieving remote code execution.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00859 58th percentileScored 2026-11-07
Fix Fixed grav (getgrav): 2.0.15getgrav/grav (Packagist): 2.0.15

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
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 2.0.152.0.15Patch availableCNA
—getgrav/grav (Packagist)before 2.0.152.0.15Patch availableGHSA-f8wv-xp27-6gq7
  • grav Vendorgetgrav Affected before 2.0.15 Fixed in 2.0.15 Patch available CNA
  • getgrav/grav (Packagist) Vendor— Affected before 2.0.15 Fixed in 2.0.15 Patch available GHSA-f8wv-xp27-6gq7

Remediation

  • Fix · CNA grav (getgrav) Fixed in 2.0.15
  • Fix · GHSA-f8wv-xp27-6gq7 getgrav/grav (Packagist) Fixed in 2.0.15 Advisory →

Fixed in the same release

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

  • Release ·

    getgrav grav 2.0.15

    4 records Highest priority Priority HIGH 2 HIGH, 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-53074 Grav before 2.0.15 Stored XSS via detectXss() Quote BypassPriority HIGH 75
    • TI-2026-53077 Grav before 2.0.15 Stored XSS via audio/video source URLPriority MEDIUM 56
    • TI-2026-52624 Grav before 2.0.15 Path Traversal via plugin-asset-map.phpPriority LOW 36
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-75827
  2. 2026-10-03 Alias added: GHSA-f8wv-xp27-6gq7

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-2026-50940 Grav CMS before 2.0.16 Origin Validation Bypass via Referer CVSS 4.0CRITICAL 9.3
  • 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
See all 228 →

Sources

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