Grav API Plugin versions before 1.0.10 fail to validate the groups field in InvitationsController::create(), allowing authenticated api.users.write callers to assign invited accounts to groups that grant api.super permissions. Attackers can create invitation records with elevated group membership, and when accepted, the new account gains full super-admin API access without the inviter holding those permissions.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/getgrav/grav/commit/345e79e3abf8c15f80e612a09f6643300071324b
disclosure@vulncheck.com
https://github.com/getgrav/grav/commit/f9438d4e71389b1041ac60b69b0b5714ecfa3bdd
disclosure@vulncheck.com
https://github.com/getgrav/grav/security/advisories/GHSA-m86m-jjcg-gcvv
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/grav-api-plugin-privilege-escalation-via-i…
disclosure@vulncheck.com