GoatCounter through 2.7.0 contains a mass assignment privilege escalation vulnerability in the userPrefSave handler that allows logged-in users to modify protected account fields via form-encoded requests. Attackers with read-only access can POST user.access[all]=* and user.email_verified=true to /user/pref, bypassing readonly tags to gain superuser or admin access.
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
Low
Partial data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/arp242/goatcounter
disclosure@vulncheck.com
https://github.com/arp242/goatcounter/blob/7e91d8a9bdbb0dd48496e498c5680f8f3477…
disclosure@vulncheck.com
https://github.com/arp242/goatcounter/blob/7e91d8a9bdbb0dd48496e498c5680f8f3477…
disclosure@vulncheck.com
https://hackmd.io/@haind03/goatcounter-user-pref-access-mass-assignment-20261011
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/goatcounter-through-2.7.0-privilege-escala…
disclosure@vulncheck.com