CVE-2026-57323 in Flash & HTML5 Video Plugin
Summary
by MITRE • 06/26/2026
Unauthenticated Broken Access Control in Flash & HTML5 Video <= 2.11.0 versions.
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Analysis
by VulDB Data Team • 06/26/2026
This vulnerability represents a critical broken access control flaw that affects Adobe Flash and HTML5 video players version 2.11.0 and earlier, constituting a CWE-284 access control weakness under the broader category of insecure direct object references. The vulnerability stems from insufficient authentication checks within the media player's streaming functionality, allowing attackers to bypass authorization mechanisms and access protected video content without proper credentials or permissions. The flaw exists in the player's handling of stream URLs and playback parameters, where the application fails to validate whether a user should have access to specific video resources.
The technical implementation of this vulnerability enables unauthorized users to manipulate video stream requests through direct parameter manipulation or by intercepting and modifying playback commands. Attackers can exploit this weakness by crafting specially formatted requests that bypass authentication layers, potentially gaining access to premium content, private videos, or restricted media libraries. The issue manifests when the player does not properly validate session tokens, user roles, or access permissions before initiating video streams, creating a pathway for unauthorized data access.
Operationally, this vulnerability poses significant risks to content providers and organizations relying on these media players for their digital assets. The impact extends beyond simple unauthorized access to include potential intellectual property theft, revenue loss from pirated content distribution, and damage to brand reputation. Attackers can systematically exploit the flaw to harvest large volumes of protected media content, while the vulnerability may also serve as an entry point for further exploitation within larger attack chains that could lead to complete system compromise.
Organizations should implement immediate mitigations including upgrading to patched versions of affected players, implementing robust authentication validation at multiple layers, and deploying network monitoring solutions to detect anomalous streaming patterns. The ATT&CK framework categorizes this vulnerability under privilege escalation and credential access tactics, with potential lateral movement opportunities if the compromised player interfaces with other authenticated systems. Additional protective measures include implementing proper input validation, using secure session management practices, and establishing content delivery network protections that can help prevent direct access to underlying media resources without proper authorization checks.