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The Stop Spammers Classic plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2026.1. This is due to missing nonce validation in the ss_addtoallowlist class. This makes it possible for unauthenticated attackers to add arbitrary email addresses to the spam allowlist via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. The vulnerability was partially patched in version 2026.1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Stop Spammer Registrations Plugin Plugin | — | Update stop-spammer-registrations-plugin plugin to version 2026.2, or a newer patched version | Jan 28, 2026 | Jan 27, 2026 |
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