SecuriTricks - CVE-2025-71278

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.

Product(s) Impacted

Vendor	Product	Versions
Xenforo	Xenforo	*

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-863

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	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/

CVSS Score

8.7 / 10

CVSS Data - 4.0

Attack Vector: NETWORK
Attack Complexity: LOW
Attack Requirements: NONE
Privileges Required: LOW
User Interaction: NONE
Scope:
Confidentiality Impact: HIGH
Integrity Impact: HIGH
Availability Impact: HIGH
Exploit Maturity: NOT_DEFINED

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

View Vector String

Timeline

Published: April 1, 2026, 1:16 a.m.
Last Modified: April 1, 2026, 6:51 p.m.

Status : Analyzed

CVE has had analysis completed and all data associations made.

More info

Source

[email protected]

CVE-2025-71278