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OpenAdvisories
High · 8.8 CVE-2025-71278 EUVD-2025-209150GHSA-499p-g3jm-62mp

XenForo OAuth2 Unauthorized Scope Request

Published Apr 1, 2026 · Updated Apr 1, 2026 · Assigned by VulnCheck

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

VendorProductAffectedFixed
XenForo XenForo 2.3.0 – < 2.3.5 2.3.5

References