Vulnerability · Published Nov 7, 2026 · Assigned by Wordfence
CVE-2026-115548Quttera ThreatSign <= 4.1.0.48 - Unauthenticated Stored Cross-Site Scripting via User-Agent Header
High 7.2
In plain English
A high-severity cross-site scripting in Quttera ThreatSign – Web Malware Scanner for WordPress from quttera. There are no confirmed reports of exploitation so far.
Severity (CVSS 3.1)7.2High
Exploit odds (30 days)–no EPSS score yet
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
The Quttera ThreatSign – Web Malware Scanner for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'HTTP_USER_AGENT' parameter in all versions up to, and including, 4.1.0.48 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever an administrator accesses an injected page.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| quttera | Quttera ThreatSign – Web Malware Scanner for WordPress | 0 – through 4.1.0.48 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/eacc5af0-3248-4819-b90e-0f5e0e6d2786?source=cve
- https://plugins.trac.wordpress.org/browser/quttera-web-malware-scanner/tags/4.1.0.45/qtrAjaxHandler.php#L1199
- https://plugins.trac.wordpress.org/browser/quttera-web-malware-scanner/tags/4.1.0.45/JS/iscan_frontend.php#L112
- https://plugins.trac.wordpress.org/browser/quttera-web-malware-scanner/tags/4.1.0.45/qtrDatabaseScanner.php#L345
- https://plugins.trac.wordpress.org/browser/quttera-web-malware-scanner/tags/4.1.0.45/qtrReport.php#L133
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3771915%40quttera-web-malware-scanner&new=3771915%40quttera-web-malware-scanner