XSS in Xenforo
CVE-2026-35057
XenForo before 2.3.10 and before 2.2.19 is vulnerable to stored cross-site scripting (XSS) in structured text mentions, primarily affecting legacy profile post content. An attacker can inject malicious scripts through crafted mentions that are stored and executed when other users view the content.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (14.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 14.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001
Affected products
- Xenforo — versions 2.3.0, 0
Weakness classification (CWE)
References
- xenforo.com/community/threads/xenforo-2-3-10-add-ons-and-2-2-19-released-includ… (vendor-advisory, Release Notes, patch)
- github.com/methosiea/xenforo-2-xss (Exploit, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2026-35057?
- CVE-2026-35057 is a medium-severity vulnerability in Xenforo, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-04-01.
- How severe is CVE-2026-35057?
- Medium severity. CVSS v3 base score is 6.4 out of 10.