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CVE-2026-19986— Adblock for Youtube Extension Event Listener contentscript.js updateDynamicRules improper authorization

Quick assessment

Affected
n/a Adblock for Youtube Extension
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Adblock for YouTube是Adblock公司的一款屏蔽视频平台广告的浏览器扩展程序。 Adblock for YouTube 7.2.1及之前版本存在安全漏洞，该漏洞源于contentscript.js文件的updateDynamicRules函数对yt-anti-Adblock-detected参数操作不当，导致授权不当，可能允许远程攻击。

CVSS 5.4 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
n/a Adblock for Youtube Extension 7.2.0 affected
7.2.1 affected
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I. Basic Information for CVE-2026-19986

Vulnerability Information
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Vulnerability Title
Adblock for Youtube Extension Event Listener contentscript.js updateDynamicRules improper authorization
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Adblock for YouTube 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Adblock for YouTube是Adblock公司的一款屏蔽视频平台广告的浏览器扩展程序。 Adblock for YouTube 7.2.1及之前版本存在安全漏洞，该漏洞源于contentscript.js文件的updateDynamicRules函数对yt-anti-Adblock-detected参数操作不当，导致授权不当，可能允许远程攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- Adblock for Youtube Extension 7.2.0 cpe:2.3:a:adblock_for_youtube_extension:adblock_for_youtube_extension:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-19986

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III. Intelligence Information for CVE-2026-19986

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Vendor Advisories for CVE-2026-19986 (1)

Security Blog Posts for CVE-2026-19986 (1)

Other References for CVE-2026-19986 (2)

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Showing top 20 of 34 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same vendor: n/a
Same weakness: CWE-285

V. Comments for CVE-2026-19986

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