VULNERABILITY INTELLIGENCE

CVE-2021-24307

CVSS score8.8 HIGH

EPSS probability53.27%

CISA KEVNot currently listed

Published2021-05-24

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Description

The All in One SEO – Best WordPress SEO Plugin – Easily Improve Your SEO Rankings before 4.1.0.2 enables authenticated users with "aioseo_tools_settings" privilege (most of the time admin) to execute arbitrary code on the underlying host. Users can restore plugin's configuration by uploading a backup .ini file in the section "Tool > Import/Export". However, the plugin attempts to unserialize values of the .ini file. Moreover, the plugin embeds Monolog library which can be used to craft a gadget chain and thus trigger system command execution.

Weakness classification

contact@wpscan.com: CWE-502
nvd@nist.gov: CWE-502

Primary references

contact@wpscan.com — Release Notes, Vendor Advisory
contact@wpscan.com — Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory