Quttera ThreatSign <= 4.1.0.48 - Unauthenticated Stored Cross-Site Scripting via User-Agent Header

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0037, the 31st percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 7 Nov 2026, 11:26 UTC Confirmed by the CVE List
2. 7 Nov 2026, 11:35 UTC First seen by agentprime
3. 7 Nov 2026, 12:17 UTC Confirmed by NVD

Sources

• CVE List: CVE-2026-115548
• NVD: CVE-2026-115548

References from the CNA

• www.wordfence.com/threat-intel/vulnerabilities/id/eacc5af0-3248-4819-b90e-0f5e0e6d2786?source=cve
• plugins.trac.wordpress.org/browser/quttera-web-malware-scanner/tags/4.1.0.45/qtrAjaxHandler.php#L1199
• plugins.trac.wordpress.org/browser/quttera-web-malware-scanner/tags/4.1.0.45/JS/iscan_frontend.php#L112
• plugins.trac.wordpress.org/browser/quttera-web-malware-scanner/tags/4.1.0.45/qtrDatabaseScanner.php#L345
• plugins.trac.wordpress.org/browser/quttera-web-malware-scanner/tags/4.1.0.45/qtrReport.php#L133
• plugins.trac.wordpress.org/changeset?reponame=&old=3771915%40quttera-web-malware-scanner&new=3771915%40quttera-web-malware-scanner

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.