CVE-2026-57323: Flash & HTML5 Video Auth Bypass Flaw

CVE-2026-57323 Overview

CVE-2026-57323 is a broken access control vulnerability affecting the Flash & HTML5 Video WordPress plugin in versions up to and including 2.11.0. The flaw allows unauthenticated attackers to interact with plugin functionality that should require authorization checks. The issue is classified under CWE-862: Missing Authorization. Because the plugin is deployed on WordPress sites accessible over the internet, exploitation requires no user interaction and no prior credentials. The vulnerability was published to the National Vulnerability Database (NVD) on 2026-06-26.

Critical Impact
Unauthenticated attackers can access protected plugin functionality across the security boundary, potentially disclosing limited confidential information from affected WordPress installations.

Affected Products

Flash & HTML5 Video WordPress plugin versions <= 2.11.0
WordPress sites running the html5-video-player plugin
Any deployment exposing the vulnerable plugin endpoints to the network

Discovery Timeline

2026-06-26 - CVE-2026-57323 published to NVD
2026-06-26 - Last updated in NVD database

Technical Details for CVE-2026-57323

Vulnerability Analysis

The Flash & HTML5 Video plugin exposes functionality without performing the authorization checks required to enforce its intended trust boundary. The weakness maps to CWE-862: Missing Authorization, a class of defect in which the application executes privileged actions without verifying that the requesting principal is entitled to perform them.

Because the vulnerability is reachable over the network by an unauthenticated actor, an attacker only needs to send crafted HTTP requests to a WordPress site running an affected plugin version. Successful requests cross the plugin's security scope, which is why the CVSS scope is marked as changed. The result is limited disclosure of information that the plugin should have restricted.

Root Cause

The root cause is the absence of an authorization check on a plugin request handler. The handler processes requests without validating the caller's role, capability, or nonce. WordPress plugins typically enforce access using current_user_can() or capability-scoped nonces; the affected handler in versions <= 2.11.0 does not.

Attack Vector

Exploitation occurs remotely over HTTP or HTTPS against the WordPress site. The attacker sends a request to the vulnerable plugin endpoint. No authentication, session, or user interaction is required. Full technical details are documented in the Patchstack Vulnerability Report.

No public proof-of-concept exploit code is available at the time of publication, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-57323

Indicators of Compromise

Unauthenticated HTTP requests to plugin endpoints under /wp-content/plugins/html5-video-player/ originating from unexpected sources
WordPress access logs containing anomalous admin-ajax.php or REST API calls referencing the plugin without a valid authenticated session cookie
Bursts of requests targeting the plugin from a single IP address enumerating parameters

Detection Strategies

Inventory WordPress installations and identify sites running the html5-video-player plugin at version <= 2.11.0
Deploy web application firewall (WAF) rules that flag unauthenticated access to plugin handlers requiring privileged capabilities
Correlate WordPress audit logs with network telemetry to identify access to plugin endpoints outside of expected administrative workflows

Monitoring Recommendations

Enable verbose logging on WordPress and forward logs to a centralized analytics platform for retention and query
Alert on repeated 200-response requests to plugin endpoints from IP addresses that have never authenticated
Track outbound data volumes from WordPress hosts to identify unexpected disclosure patterns

How to Mitigate CVE-2026-57323

Immediate Actions Required

Identify all WordPress sites running the Flash & HTML5 Video plugin and confirm the installed version
Update the plugin to a version later than 2.11.0 once a patched release is available from the vendor
Restrict administrative and plugin endpoints to trusted networks using WAF or reverse-proxy access rules until patching is complete

Patch Information

Refer to the Patchstack Vulnerability Report for the authoritative fixed-version guidance. Apply the patched release across all affected WordPress installations and verify the plugin version after deployment.

Workarounds

Temporarily disable the Flash & HTML5 Video plugin on sites where an immediate patch cannot be applied
Block unauthenticated requests to the plugin's endpoints at the WAF or reverse proxy
Restrict access to /wp-admin/admin-ajax.php and the WordPress REST API by source IP where feasible

bash

# Example: block unauthenticated access to the plugin path at nginx
location ~* /wp-content/plugins/html5-video-player/ {
    allow 10.0.0.0/8;
    deny all;
}