What’s Vulnerable › Vulnerabilities
CVE-2026-19856: All in One SEO < 5.0.2.1 - Unauthenticated Arbitrary Shortcode Execution via Search Query
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-02 · updated 2026-10-06
- Weakness: CWE-74
Description
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
- smub All in One SEO – Powerful SEO Plugin to Boost SEO Rankings & Increase Traffic: before 5.0.2.1 — fixed in 5.0.2.1
How to fix
Upgrade to a fixed version: smub All in One SEO – Powerful SEO Plugin to Boost SEO Rankings & Increase Traffic 5.0.2.1. Check the vendor advisory for mitigations.
References
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