CVE-2026-86823: Unknown Newsletter

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Unknown Newsletter: before 9.3.7 (fixed in 9.3.7)

Published 2026-09-16. Last modified 2026-09-17.