Executive Summary

The WordPress Flash & HTML5 Video Plugin, versions 2.11.0 and below, contains a Broken Access Control vulnerability identified as CVE-2026-57323.

This vulnerability allows unauthenticated users to perform actions that normally require higher privileges because of missing authorization, authentication, or nonce token checks.

It means that attackers who are not logged in can exploit this flaw to bypass security controls and access or manipulate restricted functionality.

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Impact Analysis

This vulnerability has a moderate severity with a CVSS score of 5.8, indicating a significant risk.

Exploitation can allow unauthenticated attackers to perform privileged actions on affected websites, potentially compromising site integrity or functionality.

Because it can be exploited in mass campaigns targeting thousands of websites, it poses a widespread threat to users running vulnerable versions of the plugin.

Immediate action such as updating the plugin to version 2.11.1 or later, applying mitigation rules, or enabling auto-updates is advised to reduce risk.

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Mitigation Strategies

The immediate step to mitigate this vulnerability is to update the WordPress Flash & HTML5 Video Plugin to version 2.11.1 or later.

If updating is not possible, you should seek assistance from your hosting provider or a web developer.

Additionally, Patchstack offers a mitigation rule that can be applied to block attacks until the update is applied.

Enabling auto-updates for vulnerable plugins is also recommended to prevent exploitation.

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