CVE-2025-71278

8.7 highEPSS 0.3%

High (8.7) in xenforo xenforo. EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

8.7 high

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

8.8 high

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-10-31)
CWE: CWE-863
Published: 2026-04-01
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

xenforo:xenforo

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/

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