Newsletter <= 9.4.0 - Unauthenticated Stored Cross-Site Scripting via 'np1' Custom Field Parameter
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 Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'np1' Custom Field Parameter in all versions up to, and including, 9.4.0 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 a user accesses an injected page. The subscription endpoint (na=sa) requires no nonce, no capability check, and no CAPTCHA, and the payload can be smuggled past email-address validation by embedding the {profile_1} placeholder in the local part of the submitted address, since WordPress's is_email() permits curly braces there.
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
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-96566
- 2026-10-03 Alias added: GHSA-5p9m-8jqc-cp3g
- 2026-10-03 CISA SSVC decision points changed
References
Other 9
- https://www.wordfence.com/threat-intel/vulnerabilities/id/6e61119c-b83e-41b4-aa14-7dc61086520d?source=cve
- https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module.php#L1006
- https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L723
- https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/subscription/subscription.php#L257
- https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/classes.php#L212
- https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/profile/profile.php#L511
- https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/plugin.php#L457
- https://plugins.trac.wordpress.org/browser/newsletter/tags/9.3.9/includes/module-base.php#L1032
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3711290%40newsletter&new=3711290%40newsletter
More satollo vulnerabilities
- TI-2021-06784 Giveaway <= 1.2.2 - Authenticated SQL Injection CVSS 3.1HIGH 7.2
- TI-2024-12920 Head, Footer and Post Injections <= 3.3.0 - Authenticated (Administrator+) PHP Code Injection in Multisite Environments CVSS 3.1HIGH 7.2
- TI-2026-62415 Insufficiently protected credentials in satollo Newsletter – Send awesome emails from… CVSS 3.1MEDIUM 5.3
- TI-2023-04399 Newsletter <= 7.8.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode CVSS 3.1MEDIUM 6.4
- TI-2024-04939 Newsletter <= 8.3.4 - Unauthenticated Stored Cross-Site Scripting via np1 CVSS 3.1MEDIUM 6.4
- TI-2026-61829 Newsletter <= 9.3.8 - Reflected Cross-Site Scripting via 'nn' Parameter CVSS 3.1MEDIUM 6.1
Sources
- CVE-2026-96566 · CVE Program
- CVE-2026-96566 · NVD
- FIRST EPSS
- GHSA-5p9m-8jqc-cp3g · 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