XSS in User Frontend
CVE-2026-115277
The User Frontend WordPress plugin before 4.3.14 does not sanitise and escape some user-supplied values before reflecting them into HTML attributes in a publicly reachable AJAX response, leading to Reflected Cross-Site Scripting. The affected action is gated by an anonymous nonce that only validates for logged-out requests, so the payload executes against logged-out visitors rather than authenticated users.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (5.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
- User Frontend
Weakness classification (CWE)
References
- wpscan.com/vulnerability/b3f0ca09-1c63-4a34-90bf-7b220fcec556/ (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-115277?
- CVE-2026-115277 is a medium-severity vulnerability in User Frontend, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-10-30.
- How severe is CVE-2026-115277?
- Medium severity. CVSS v3 base score is 4.7 out of 10.