Vulnerability · Published Apr 1, 2026 · Assigned by VulnCheck
CVE-2025-71278XenForo OAuth2 Unauthorized Scope Request
High 8.8
In plain English
A high-severity incorrect authorization in XenForo from XenForo. 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 19% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.3%top 80.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
XenForo before 2.3.5 allows OAuth2 client applications to request unauthorized scopes. This affects any customer using OAuth2 clients on any version of XenForo 2.3 prior to 2.3.5, potentially allowing client applications to gain access beyond their intended authorization level.
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- XenForo 2.3.5 (Includes Security Fix) & Add-ons Released vendor-advisory, patch
- VulnCheck Advisory: XenForo OAuth2 Unauthorized Scope Request third-party-advisory