Search/CVE-2025-71278
● CVE — High

CVE-2025-71278

VendorxenforoProductxenforoDiscoveredApr 1, 2026UpdatedApr 1, 2026

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.

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CVSS v3.1
8.8 HIGH
EPSS
0.27%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
EPSS Trend
Aug 16, 2026 → Oct 30, 2026
● 0.01pp
0.27% → 0.27% over 2 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
ScopeUNCHANGED
ConfidentialityHIGH
IntegrityHIGH
AvailabilityHIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Connections
2 relationships
Timeline
disclosure → media coverage
Apr 1, 2026
Disclosure — published as a CVE record.