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CVE-2025-71278

XenForo OAuth2 Unauthorized Scope Request

Published: Apr 1, 2026Updated: Apr 1, 2026 Sources: CVE List NVDCWE-863
NVD MITRE
8.8CVSSHIGH
EPSS Score
0.3%
Top 82.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-863

Affected Products

xenforoxenforo
On-prem
Web & CMS Plugins / forum-wiki
XenForoXenForo
On-prem
Web & CMS Plugins / forum-wiki
xenforocommercialWeb & CMS Pluginsaka xenforo forum

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://www.vulncheck.com/advisories/xenforo-oauth2-unauthorized-scope-request
vulncheck.com
https://xenforo.com/community/threads/xenforo-2-3-5-includes-security-fix-add-ons-released.228812/
xenforo.com

Timeline

Published
Apr 1, 2026
Last Updated
Apr 1, 2026

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