CVE-2020-35933

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-01-01 · updated 2026-06-17
Weakness: CWE-79

Description

A Reflected Authenticated Cross-Site Scripting (XSS) vulnerability in the Newsletter plugin before 6.8.2 for WordPress allows remote attackers to trick a victim into submitting a tnpc_render AJAX request containing either JavaScript in an options parameter, or a base64-encoded JSON string containing JavaScript in the encoded_options parameter.

Affected products

satollo Newsletter – Send awesome emails from WordPress: before 6.8.2 — fixed in 6.8.2

How to fix

Upgrade to a fixed version: satollo Newsletter – Send awesome emails from WordPress 6.8.2. Check the vendor advisory for mitigations.

References

https://www.wordfence.com/blog/2020/08/newsletter-plugin-vulnerabilities-affect-over-300000-sites/
https://www.wordfence.com/blog/2020/08/newsletter-plugin-vulnerabilities-affect-over-300000-sites/

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