CVE-2025-71278

EUVD-2025-209150
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.8 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
VulnCheckCNA
8.8 HIGH
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
xenforoxenforo
2.3.0 ≤
𝑥
< 2.3.5
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://www.vulncheck.com/advisories/xenforo-oauth2-unauthorized-scope-request
https://xenforo.com/community/threads/xenforo-2-3-5-includes-security-fix-add-ons-released.228812/