XenForo <2.3.5 OAuth2 Unauthorized Scope Vulnerability
CVE-2025-71278 Published on April 1, 2026
XenForo OAuth2 Unauthorized Scope Request
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.
Vulnerability Analysis
CVE-2025-71278 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2025-71278 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2025-71278
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Affected Versions
XenForo:- Version 2.3.0 and below 2.3.5 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.