CVE-2021-24311
Published: April 11, 2026
Official Description
The wp_ajax_upload-remote-file AJAX action of the External Media WordPress plugin before 1.0.34 was vulnerable to arbitrary file uploads via any authenticated users.
Risk Analysis
The External Media WordPress plugin contains an arbitrary file upload vulnerability via an AJAX action, exploitable by any authenticated user. This could lead to remote code execution and compromise of the website. Its inclusion in CISA's KEV catalog indicates active exploitation and high urgency.
This vulnerability is actively exploited in the wild and is listed in CISA's Known Exploited Vulnerabilities Catalog. Exploitation requires an authenticated user account.
Update the External Media WordPress plugin to version 1.0.34 or later. Restrict file upload functionality to trusted users and implement strict validation for all uploaded files.
Technical Analysis
CVE-2021-24311 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2021-24311 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-24311 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1