Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| arp242 | GoatCounter | ≤ 2.7.0 | — |
References
- https://hackmd.io/@haind03/goatcounter-user-pref-access-mass-assignment-20261011 third-party-advisory
- https://github.com/arp242/goatcounter/blob/7e91d8a9bdbb0dd48496e498c5680f8f3477a1b4/handlers/settings_user.go#L33-L99 technical-description
- https://github.com/arp242/goatcounter/blob/7e91d8a9bdbb0dd48496e498c5680f8f3477a1b4/user.go#L191-L218 technical-description
- https://github.com/arp242/goatcounter product
- VulnCheck Advisory: GoatCounter through 2.7.0 Privilege Escalation via /user/pref Mass Assignment third-party-advisory