Stored cross-site scripting in Quttera ThreatSign WordPress plugin
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
The Quttera ThreatSign Web Malware Scanner for WordPress plugin is vulnerable in all versions up to and including 4.1.0.48. Insufficient input sanitization and output escaping of the HTTP_USER_AGENT header allow stored cross-site scripting (CWE-79). An unauthenticated attacker can inject arbitrary web scripts that execute when an administrator accesses an injected page.
Written with Claude Haiku 5.5 from the sources below · 2026-11-07
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
The sources list no fixed version for Quttera ThreatSign Web Malware Scanner for WordPress.
Written with Claude Haiku 5.5 from the sources below · 2026-11-07
Timeline
- 2026-11-07 Threatist record created from CVE-2026-115548
- 2026-11-07 Alias added: GHSA-45m2-gfv6-r6wq
- 2026-11-07 CISA SSVC decision points changed
- 2026-11-07 Priority changed: MEDIUM → LOW
References
Other 6
- 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
More quttera vulnerabilities
- TI-2023-05715 Quttera Web Malware Scanner < 3.4.2.1 - Admin+ Path Traversal CVSS 3.1HIGH 7.2
- TI-2023-05583 Quttera Web Malware Scanner < 3.4.2.1 - Directory Listing to Sensitive Data Exposure CVSS 3.1MEDIUM 5.3
- TI-2025-07332 Quttera Web Malware Scanner <= 3.5.1.41 - Authenticated (Administrator+) Server-Side Request Forgery CVSS 3.1LOW 3.8
Sources
- CVE-2026-115548 · CVE Program
- CVE-2026-115548 · NVD
- GHSA-45m2-gfv6-r6wq · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences