CVE-2026-86823
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
The Newsletter WordPress plugin before 9.3.7 does not validate the destination of the redirect performed after a public subscription action. Unauthenticated attackers can redirect users to arbitrary external sites and disclose a subscriber token that grants access to that subscriber record's front-end actions.
Risk Assessment
Disclosure of the subscriber token allows manipulation of subscriber data, and open redirects can be exploited in phishing campaigns. This may lead to loss of trust and personal data breaches.
Recommendation
Update the Newsletter plugin to version 9.3.7 or later. Consider invalidating existing subscriber tokens after the update.
Other vulnerabilities in Newsletter
See all- CVE-2026-90981Medium
The Newsletter – Send awesome emails from WordPress plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'nn' parameter in all versions up to, and including, 9.3.8 due to insufficient input sanitization and output escaping. Unauthenticated attackers can inject arbitrary web scripts if they trick a user into clicking a link.
- CVE-2026-66596High
Unauthenticated Cross Site Scripting (XSS) vulnerability in Newsletter plugin versions up to 9.3.3. An attacker can inject malicious script without authentication.
Original NVD description (English source)
The Newsletter WordPress plugin before 9.3.7 does not validate the destination of the redirect performed after a public subscription action, allowing unauthenticated attackers to redirect users to arbitrary external sites and to disclose a subscriber token that grants access to that subscriber record's front-end actions.