CVE-2026-109367

All in One SEO <= 5.0.3 - Unauthenticated Sensitive Information Disclosure in 's' Search Query Parameter

2026-10-30 20:26
Santh

Strategic Overview

Status
Patched in 5.0.4
Affected Plugin
All in One SEO – AI SEO Plugin to Boost SEO Rankings & Traffic (Schema, Local SEO, Sitemap & SEO Insights)
Affected Version
<= 5.0.3
CVSS
5.3Medium
Weakness type
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
CVE
CVE-2026-109367
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-2026-109367 is a medium-severity Exposure of Sensitive Information to an Unauthorized Actor vulnerability in the All in One SEO WordPress plugin, affecting versions <= 5.0.3. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 5.0.4; sites on affected versions should update now. Disclosed October 2026, reported by Santh.

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 Sensitive Information Exposure in all versions up to, and including, 5.0.3 via the 's' parameter. This makes it possible for unauthenticated attackers to extract arbitrary non-public post meta values, including sensitive custom fields such as API keys and internal notes, emitted verbatim into the HTML title element and JSON-LD SearchResultsPage schema.

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, and no interaction from a victim user.

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Reaching this weakness in All in One SEO <= 5.0.3 takes no account at all. Sensitive information exposure means data the application intended to keep internal is returned to a caller who should not be able to see it.

The disclosed data — credentials, tokens, customer records or internal paths — is usually worth more as material for a follow-up attack than as an end in itself. For All in One SEO the fix is 5.0.4: builds <= 5.0.3 are affected, anything from 5.0.4 onward is not.

Remediation

Update to version 5.0.4, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: All in One SEO 5.0.4 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-109367https://www.wordfence.com/threat-intel/vulnerabilities/id/75510022-382c-4d03-9c59-1d06349e72bbhttps://nvd.nist.gov/vuln/detail/CVE-2026-109367

Related records

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