Vulnerability · Published Apr 1, 2026 · Assigned by VulnCheck
CVE-2026-35057XenForo Stored Cross-Site Scripting via Structured Text Mentions
Medium 6.4
In plain English
A medium-severity cross-site scripting in XenForo from XenForo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.2%top 93.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
References
- XenForo 2.3.10 & Add-ons and 2.2.19 Released (Includes Security Fix) vendor-advisory, patch
- XenForo 2.x Stored XSS via Placeholder Collision PoC exploit