CVE-2026-96566 json
Newsletter <= 9.4.0 - Unauthenticated Stored Cross-Site Scripting via 'np1' Custom Field Parameter
published 2026-10-02 38 d ago modified 2026-10-03 37 d ago also EUVD-2026-91248
- cvss
- 7.2
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 19%
- public exploits
- 0
- none known
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 37 d ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |
Affected products
- satollo Newsletter – Send awesome emails from WordPress
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/6e61119c-b83e-41b4-aa14-7dc61086520d?source=cve
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/includes/module.php#L1006
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/subscription/subscription.php#L723
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/subscription/subscription.php#L257
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/includes/classes.php#L212
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/profile/profile.php#L511
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/plugin.php#L457
- plugins.trac.wordpress.org /browser/newsletter/tags/9.3.9/includes/module-base.php#L1032
- plugins.trac.wordpress.org /changeset?reponame=&old=3711290%40newsletter&new=3711290%40newsletter
Sources
- CVE List CVE-2026-96566
- NVD CVE-2026-96566
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.