EUVD-2026-60048
GHSA-9h57-f8p2-fmg7
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-delivered DOM event requires no privileges; victim must navigate to the malicious page (UI:R); impact is limited to extension rule integrity and availability with no confidentiality exposure.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
4DescriptionCVE.org
A weakness has been identified in Adblock for Youtube Extension up to 7.2.1 on Chrome. The impacted element is the function updateDynamicRules of the file contentscript.js of the component Event Listener. This manipulation of the argument yt-anti-adblock-detected causes improper authorization. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
AnalysisAI
Persistent ad-blocking bypass in Adblock for Youtube Extension versions up to 7.2.1 on Google Chrome allows remote web content to silently disable the extension's filtering rules by exploiting an improper authorization flaw (CWE-285) in the contentscript.js event listener. The updateDynamicRules function processes the yt-anti-adblock-detected DOM event without verifying the caller's origin or authorization, meaning any adversarial webpage can trigger the function and persistently disable ad blocking. Publicly available exploit code demonstrates this technique; the vulnerability is not listed in the CISA KEV catalog and no vendor patch exists, as the maintainer did not respond to pre-disclosure outreach.
Technical ContextAI
Chrome browser extensions inject content scripts (contentscript.js) into web page contexts and can communicate bidirectionally with host pages via DOM events. This extension registers an event listener for the custom event yt-anti-adblock-detected - a signal YouTube uses to notify extensions of its own anti-adblock detection state. The updateDynamicRules function that handles this event fails to validate that the dispatched event originates from a trusted or expected source, a textbook CWE-285 (Improper Authorization) failure. Chrome's extension architecture places content scripts in the same DOM as the host page, meaning any page can dispatch events that content scripts receive unless the script explicitly checks event provenance against a trusted origin. This architectural trust boundary confusion is the root cause. The affected CPE is cpe:2.3:a:n/a:adblock_for_youtube_extension:*:*:*:*:*:*:*:*, covering all releases through 7.2.1.
RemediationAI
No vendor-released patch has been identified at time of analysis - the vendor did not respond to disclosure, and no fixed version number is available from any reference. The primary recommended action is to remove or disable the Adblock for Youtube Extension (versions through 7.2.1) from Chrome immediately. Users requiring ad-blocking functionality should migrate to an actively maintained alternative extension with a responsive security disclosure process. As a compensating control short of removal, Chrome users can restrict the extension to specific site permissions via chrome://extensions, limiting which pages can interact with the content script's DOM; this reduces but does not eliminate the attack surface, since YouTube itself is a likely permitted origin. Chrome enterprise administrators can block installation of the specific extension ID via managed browser policy. Monitor https://vuldb.com/vuln/391190 and the public POC at https://github.com/xryj920/chrome_extensions/ for updates on a patched release.
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Same weakness CWE-285 – Improper Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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