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.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
patch
XenForo 2.3.5 (Includes Security Fix) & Add-ons Released
https://xenforo.com/community/threads/xenforo-2-3-5-includes-security-fix-add-ons-released.228812/
Third Party Advisory third-party-advisory
VulnCheck Advisory: XenForo OAuth2 Unauthorized Scope Request
https://www.vulncheck.com/advisories/xenforo-oauth2-unauthorized-scope-request
Scores
CVSS v3
8.8
EPSS
0.0027
EPSS Percentile
17.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-863
Status
published
Products (2)
XenForo/XenForo
2.3.0 - 2.3.5
xenforo/xenforo
2.3.0 - 2.3.5
Published
Apr 01, 2026
Tracked Since
Apr 01, 2026