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6.4
WordPress Post Flagger Plugin Allows Malicious Code Injection
CVE-2026-1854
Summary
The Post Flagger plugin for WordPress can be exploited by authorized users with contributor-level access to inject malicious code into pages that will execute when visited, potentially allowing attackers to take control of the site or steal user data. This issue affects all versions up to and including 1.1. Users should update to a fixed version as soon as possible.
Original title
The Post Flagger plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'flag' shortcode in all versions up to, and including, 1.1 due to insufficient input sanitization...
Original description
The Post Flagger plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'flag' shortcode in all versions up to, and including, 1.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
nvd CVSS3.1
6.4
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
Published: 21 Mar 2026 · Updated: 21 Mar 2026 · First seen: 21 Mar 2026