CVE-2026-8905
Description
The Osiris Signature Banner plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 0.5. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to update settings and inject malicious web scripts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
Summary dbcve.org
The Osiris Signature Banner WordPress plugin lacks proper nonce validation on a settings function, allowing unauthenticated attackers to forge administrative requests. This CSRF vulnerability enables attackers to modify plugin settings and inject malicious web scripts, as the application cannot verify the request originated from an legitimate admin session.
Mitigation
Update to a patched version once released; in the meantime, implement nonce verification on all settings-related functions in the plugin to validate request authenticity.