XSS in Quttera Threatsign – Web Malware Scanner For WordPress

CVE-2026-115548

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-115548?
CVE-2026-115548 is a high-severity vulnerability in Quttera Threatsign – Web Malware Scanner For WordPress, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-11-07.
How severe is CVE-2026-115548?
High severity. CVSS v3 base score is 7.2 out of 10.