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TI-2026-58984 Aliases CVE-2026-86195GHSA-rg66-gwrp-wj75

grav-plugin-api 1.0.0 through 1.0.19 Privilege Escalation via Dot-Keyed Super Flag

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
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-269.

Summary

grav-plugin-api versions before 1.0.20 contain a privilege escalation vulnerability in the InvitationsController where the stripSuperFlags() method only removes nested super flags but fails to strip dot-keyed equivalents like api.super. A non-super user manager with api.access and api.users.write permissions can create an invitation with a dot-keyed super flag in the access payload that bypasses the guard and persists to the new account. Attackers can accept the invitation through the public endpoint without real invitee interaction to create a super-admin account and immediately receive a valid JWT for full site control.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00387 32nd percentileScored 2026-11-07
Fix Fixed grav-plugin-api (getgrav): 1.0.20

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
getgravgrav-plugin-apibefore 1.0.201.0.20Patch availableCNA
  • grav-plugin-api Vendorgetgrav Affected before 1.0.20 Fixed in 1.0.20 Patch available CNA

Remediation

  • Fix · CNA grav-plugin-api (getgrav) Fixed in 1.0.20

Fixed in the same release

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

  • Release ·

    getgrav grav-plugin-api 1.0.20

    3 records Highest priority Priority HIGH 3 HIGH

    Other records, highest priority first

    • TI-2026-58985 Grav API Plugin before 1.0.20 Authentication Bypass via Host HeaderPriority HIGH 73
    • TI-2026-58982 Grav API Plugin Authentication Bypass via Group-Inherited SuperPriority HIGH 73
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86195
  2. 2026-10-03 Alias added: GHSA-rg66-gwrp-wj75

References

Advisory 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