RCE in Xenforo
CVE-2026-35056
XenForo before 2.3.9 and before 2.2.18 allows remote code execution (RCE) by authenticated, but malicious, admin users. An attacker with admin panel access can execute arbitrary code on the server.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (58.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.009 · change: +0.002
Affected products
- Xenforo — versions 2.3.0, 0
Weakness classification (CWE)
References
- xenforo.com/community/threads/xenforo-2-3-9-inc-xfmg-2-2-18-released-security-f… (vendor-advisory, Release Notes, patch)
- www.vulncheck.com/advisories/xenforo-remote-code-execution-via-authenticated-ad… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-35056?
- CVE-2026-35056 is a high-severity vulnerability in Xenforo, classified under Code Injection. CVSS score: 7.2/10. Published 2026-04-01.
- How severe is CVE-2026-35056?
- High severity. CVSS v3 base score is 7.2 out of 10.