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All in One SEO <= 4.1.0.1 — Authenticated Code Injection

CVE-2021-24307Published · Updated

Action summary

Affected: <4.1.0.2Update to 4.1.0.2 or newer

All remediation steps
Watch plugin
Severity
High8.8
CVSS
8.8
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:L Privileges required
Low
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-94 Improper Control of Generation of Code
Required access
Unknown
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

All in One SEO – AI SEO Plugin to Boost SEO Rankings & Traffic (Schema, Local SEO, Sitemap & SEO Insights) all-in-one-seo-pack

  1. Affected< 4.1.0.2
  2. Patched in4.1.0.2

Update to 4.1.0.2 or newer.

You are affected if you run < 4.1.0.2. Version 4.1.0.2 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under All in One SEO – AI SEO Plugin to Boost SEO Rankings & Traffic (Schema, Local SEO, Sitemap & SEO Insights).
  • No admin access? Run a passive check of your site. It reads public files only.

What to do

  1. Update to version 4.1.0.2, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch All in One SEO – AI SEO Plugin to Boost SEO Rankings & Traffic (Schema, Local SEO, Sitemap & SEO Insights) to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Vincent MICHEL.

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.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in All in One SEO – AI SEO Plugin to Boost SEO Rankings & Traffic (Schema, Local SEO, Sitemap & SEO Insights)

All 33
More vulnerabilities in All in One SEO – AI SEO Plugin to Boost SEO Rankings & Traffic (Schema, Local SEO, Sitemap & SEO Insights)
SeverityVulnerabilityCVEPublished
Medium5.3Unauthenticated Sensitive Information Disclosure in 's' Search Query Parameter
≤5.0.3Update to 5.0.4
CVE-2026-109367
Medium6.5Unauthenticated Arbitrary Shortcode Execution via 's' Search Query Parameter
≤5.0.2Update to 5.0.2.1
CVE-2026-100152
Medium6.5Unauthenticated Arbitrary Shortcode Execution
≤5.0.2.0Update to 5.0.2.1
CVE-2026-19856
Medium6.1Reflected DOM-Based Cross-Site Scripting via URL Pathname
≤5.0.1.1Update to 5.0.2
CVE-2026-85492
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting
≤5.0.0.0Update to 5.0.0.1
CVE-2026-82884

Timeline

  1. CVE published

    Severity high, CVSS 8.8

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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