CVE-2026-19986CWE-266CWE-285

CVE-2026-19986

Medium · published August 17, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
35.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
CVSS v4.0
5.3 · 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
EPSS
0.00418 · 35.0th percentile
Weaknesses
CWE-266 · Incorrect Privilege Assignment; CWE-285 · Improper Authorization
Published
2026-08-17T09:17Z
References (6)
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%20event · [email protected]https://vuldb.com/cve/CVE-2026-19986 · [email protected]https://vuldb.com/submit/873935 · [email protected]https://vuldb.com/vuln/391190 · [email protected]https://vuldb.com/vuln/391190/cti · [email protected]https://vuldb.com/submit/873935 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 AUG 05:00Z
    Adblock for Youtube Extension Event Listener contentscript.js updateDynamicRules improper authorization
    cvelistv5