CVE-2026-78146: Unknown Simple Newsletter Plugin

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

The Simple Newsletter Plugin WordPress plugin before 4.3.3 does not verify that the requester is the subscriber named in a public request before rendering that subscriber's stored details, allowing unauthenticated users to disclose a subscriber's personal data along with the key that authorises changes to their record.

Affected products

• Unknown Simple Newsletter Plugin: from 4.0.0, before 4.3.3 (fixed in 4.3.3)

Published 2026-08-26. Last modified 2026-08-26.