CVE-2025-71278XenForo before 2.3.5 allows OAuth2 client applications to request unauthorized scopes.
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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
- 8.8 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
xenforo xenforo xenforo:xenforo | from 2.3.0 before 2.3.5 | NVD |
References
- https://www.vulncheck.com/advisories/xenforo-oauth2-unauthorized-scope-requestthird-party-advisory
- https://xenforo.com/community/threads/xenforo-2-3-5-includes-security-fix-add-ons-released.228812/release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.