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TI-2026-31053 Aliases CVE-2026-42844GHSA-6xx2-m8wv-756h

Grav: Low-privileged API users can create super-admin accounts via blueprint-upload

Priority HIGH 73CWE-269Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Privilege escalation, 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-269 and CWE-434.

Summary

Grav is a file-based Web platform. In Grav 2.0.0-beta.2, a low-privileged authenticated API user with api.media.write can abuse /api/v1/blueprint-upload to write an arbitrary YAML file into user/accounts/, then log in as the newly created account with api.super privileges. This results in full administrative compromise of the Grav API. This vulnerability is fixed in API 1.0.0-beta.17.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00336 27th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed getgrav/grav (Packagist): 2.0.0-beta.4

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
getgravgrav2.0.0-beta.2—No fix listedCNA
—getgrav/grav (Packagist)before 2.0.0-beta.42.0.0-beta.4Patch availableGHSA-6xx2-m8wv-756h
  • grav Vendorgetgrav Affected 2.0.0-beta.2 Fixed in — No fix listed CNA
  • getgrav/grav (Packagist) Vendor— Affected before 2.0.0-beta.4 Fixed in 2.0.0-beta.4 Patch available GHSA-6xx2-m8wv-756h

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:getgrav:grav:2.0.0:beta2:*:*:*:*:*:*2.0.0 beta2Vulnerablegetgrav
  • cpe:2.3:a:getgrav:grav:2.0.0:beta2:*:*:*:*:*:* Versions 2.0.0 beta2 Vulnerable ·getgrav

Remediation

  • Fix · GHSA-6xx2-m8wv-756h getgrav/grav (Packagist) Fixed in 2.0.0-beta.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42844
  2. 2026-10-03 Alias added: GHSA-6xx2-m8wv-756h

References

Exploit 1

Advisory 1

Other 2

  • 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-2021-22428 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
  • TI-2026-30888 Grav: Unauthenticated Path Traversal & Arbitrary File Write in FormFlash component. CVSS 4.0HIGH 8.8
  • TI-2025-40773 Security Sandbox Bypass with SSTI (Server Side Template Injection) in the Grav CMS CVSS 3.1HIGH 8.8
  • TI-2025-40768 Grav is vulnerable to RCE via SSTI through Twig Sandbox Bypass CVSS 4.0HIGH 8.7
See all 56 →

Sources

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