On the point: A widely used Chrome extension for blocking YouTube ads contains a backdoor that could potentially lead to compromise of affected browsers.
A backdoor has been discovered in the Chrome extension Adblock for YouTube. The extension has over ten million installations, making it one of the most widespread ad blockers for the browser.
The Chrome extension Adblock for YouTube with over ten million installations has significant security vulnerabilities. Security researchers have identified a backdoor in the extension that enables attackers to execute code in affected browsers and thus compromise the systems.
For CISOs and security teams, this represents a significant risk within the organization. Browser extensions are often installed carelessly by users and frequently receive extensive permissions. A compromised extension can be leveraged as an attack vector for credential harvesting, data exfiltration, or lateral movement within the network.
As a countermeasure, organizations should review their browser policies, conduct an inventory of installed Chrome extensions, and identify and uninstall Adblock for YouTube installations on all systems. An allowlist for browser extensions, combined with MDM policies, reduces the risk of compromised or malicious extensions.
Source: www.golem.de · Published 26 June 2026
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