Vulnerability · Published Oct 11, 2026 · Assigned by VulnCheck
CVE-2026-108740GoatCounter through 2.7.0 Privilege Escalation via /user/pref Mass Assignment
High 8.3
In plain English
A high-severity security flaw in GoatCounter from arp242. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Severity (CVSS 3.1)8.3High
Exploit odds (30 days)0.3%top 73.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| arp242 | GoatCounter | 0 – through 2.7.0 |
Weakness: CWE-915 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
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