CVE-2026-82884 All in One SEO CVE debrief

Who should care

Users of All in One SEO WordPress plugin, WordPress site administrators, and security teams responsible for monitoring and patching vulnerabilities should be aware of this vulnerability. They should review and update the plugin to version 5.0.0.1 or later, implement input validation and output encoding for post content, and monitor for suspicious post editor activity. Additionally, they should restrict post editing to authorized users and perform vulnerability scanning and penetration testing to identify potential exposure.

Technical summary

The All in One SEO WordPress plugin before 5.0.0.1 does not sanitise and escape some content stored in posts before rendering it back in the post editor. This could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks that trigger when a higher privileged user edits the post. The vulnerability has a CVSS score of 6.8 and a severity of MEDIUM. Technical details suggest that the plugin does not properly handle user input, allowing for potential code injection.

Defensive priority

Medium-priority defensive review recommended due to potential Stored Cross-Site Scripting attacks.

Recommended defensive actions

• Review and update All in One SEO WordPress plugin to version 5.0.0.1 or later
• Implement input validation and output encoding for post content
• Monitor for suspicious post editor activity
• Restrict post editing to authorized users
• Perform vulnerability scanning and penetration testing to identify potential exposure
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

Evidence from the NVD and WPScan suggests potential Stored Cross-Site Scripting vulnerability in All in One SEO WordPress plugin before 5.0.0.1. The vulnerability allows users with the contributor role and above to perform Stored Cross-Site Scripting attacks that trigger when a higher privileged user edits the post. Evidence limits suggest that additional verification is required to confirm affected scope and severity. Defenders should verify post content sanitization and user role-based access controls.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.