CVE-2026-66596— WordPress Newsletter plugin <= 9.3.3 - Cross Site Scripting (XSS) vulnerability
Quick assessment
Affected
Stefano Lissa Newsletter
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Newsletter 版本 <= 9.3.3 中存在未认证的跨站脚本（XSS）漏洞。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting InterpreterAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Stefano Lissa | Newsletter | n/a≤ 9.3.3 |
affected |
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I. Basic Information for CVE-2026-66596
Vulnerability Information
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Vulnerability Title
WordPress Newsletter plugin <= 9.3.3 - Cross Site Scripting (XSS) vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Unauthenticated Cross Site Scripting (XSS) in Newsletter <= 9.3.3 versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Stefano Lissa | Newsletter | n/a ~ 9.3.3 | - |
|
II. Public POCs for CVE-2026-66596
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Other References for CVE-2026-66596 (1)
IV. Related Vulnerabilities
Same product: Newsletter
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CVE-2025-67999
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CVE-2025-3584
Newsletter < 8.8.2 - Admin+ Stored XSS via Subscription -
CVE-2025-3583
Newsletter < 8.7.1 - Admin+ Stored XSS
Same weakness: CWE-79
-
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CVE-2026-74793
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V. Comments for CVE-2026-66596
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