CVE-2026-19856: Unknown All In One Seo

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

The All in One SEO WordPress plugin before 5.0.2.1 does not correctly determine which shortcodes are present in content derived from user input before deciding which ones to strip, allowing unauthenticated users to execute arbitrary shortcodes registered on the site. On sites upgraded from older versions the protection is disabled outright, making the issue reachable without any crafted input.

Affected products

• Unknown All In One Seo: before 5.0.2.1 (fixed in 5.0.2.1)

Published 2026-10-02. Last modified 2026-10-06.