XSS in Xenforo
CVE-2023-53904
Xenforo 2.2.13 contains a stored cross-site scripting vulnerability that allows authenticated administrators to inject malicious scripts through the smilie category title parameter. Attackers can create a smilie category with a malicious script that will execute when the admin panel is loaded, potentially enabling further client-side attacks.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (17.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Xenforo — versions 2.2.13
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/51547 (exploit)
- xenforo.com/ (product)
- www.vulncheck.com/advisories/xenforo-authenticated-stored-cross-site-scripting-… (third-party-advisory)
Frequently asked questions
- What is CVE-2023-53904?
- CVE-2023-53904 is a medium-severity vulnerability in Xenforo, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2025-12-17.
- How severe is CVE-2023-53904?
- Medium severity. CVSS v3 base score is 4.6 out of 10.