CVE-2026-85492

All in One SEO <= 5.0.1.1 - Reflected DOM-Based Cross-Site Scripting via URL Pathname

2026-10-01 20:40
mak3bread

Strategic Overview

Status
Patched in 5.0.2
Affected Plugin
All in One SEO – AI SEO Plugin to Boost SEO Rankings & Traffic (Schema, Local SEO, Sitemap & SEO Insights)
Affected Version
<= 5.0.1.1
CVSS
6.1Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2026-85492
View all All in One SEO – AI SEO Plugin to Boost SEO Rankings & Traffic (Schema, Local SEO, Sitemap & SEO Insights) vulnerabilities

At a glance

CVE-2026-85492 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the All in One SEO WordPress plugin, affecting versions <= 5.0.1.1. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 5.0.2; sites on affected versions should update now. Disclosed October 2026, reported by mak3bread.

Vulnerability Overview

The All in One SEO – AI SEO Plugin to Boost SEO Rankings & Traffic (Schema, Local SEO, Sitemap & SEO Insights) plugin for WordPress is vulnerable to DOM-Based Cross-Site Scripting via URL Pathname in all versions up to, and including, 5.0.1.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user visits a crafted URL. Exploitation requires the victim to hold the aioseo_manage_seo capability and to open the SEO Preview panel in the WordPress admin toolbar while visiting a page with a malicious payload embedded in the URL pathname.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in All in One SEO <= 5.0.1.1 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For All in One SEO the fix is 5.0.2: builds <= 5.0.1.1 are affected, anything from 5.0.2 onward is not.

Remediation

Update to version 5.0.2, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to All in One SEO: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: All in One SEO 5.0.2 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-85492https://www.wordfence.com/threat-intel/vulnerabilities/id/5d4da592-3e8a-401d-b461-1770db9de654https://nvd.nist.gov/vuln/detail/CVE-2026-85492

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C