CVE-2026-19986Adblock for Youtube Extension Event Listener contentscript.js updateDynamicRules improper authorization
Updated under an hour ago ()
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It affects n/a Adblock for Youtube Extension. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:P/RL:X/RC:R
- Weakness (CWE)
- CWE-285, CWE-266
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulDB
- NVD analysis
- Deferred
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
n/a Adblock for Youtube Extension adblock_for_youtube_extension:adblock_for_youtube_extension | 7.2.0; 7.2.1 | CNA record |
References
- https://vuldb.com/vuln/391190vdb-entry, technical-description
- https://vuldb.com/vuln/391190/ctisignature, permissions-required
- https://vuldb.com/cve/CVE-2026-19986third-party-advisory
- https://vuldb.com/submit/873935third-party-advisory
- https://github.com/xryj920/chrome_extensions/blob/main/AdBlock%20Ltd.%20Adblock%20for%20Youtube%207.2.1%20allows%20persistent%20disabling%20of%20ad%20blocking%20through%20an%20unauthenticated%20DOM%20eventexploit, media-coverage
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.