arp242 GoatCounter up to 2.7.0 userPrefSave handler /user/pref access/email_verified dynamically-determined object attributes

Summaryinfo

A vulnerability, which was classified as critical, has been found in arp242 GoatCounter up to 2.7.0. Impacted is the function userPrefSave of the file /user/pref of the component userPrefSave handler. This manipulation of the argument access/email_verified causes dynamically-determined object attributes. This vulnerability is handled as CVE-2026-108740. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in arp242 GoatCounter up to 2.7.0 and classified as critical. Affected by this vulnerability is the function userPrefSave of the file /user/pref of the component userPrefSave handler. The manipulation of the argument access/email_verified with an unknown input leads to a dynamically-determined object attributes vulnerability. The CWE definition for the vulnerability is CWE-915. The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at hackmd.io. This vulnerability is known as CVE-2026-108740 since 10/11/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/11/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• arp242

Name

• GoatCounter

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7.0

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

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• 🔒
• 🔒

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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