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CVE-2026-7686— eyeo Adblock Plus Legacy Premium Activation premium.preload.js postMessage access control

Quick assessment

Affected
eyeo Adblock Plus
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 Plus是Ad-IP开源的一款广告拦截工具。 Adblock Plus 4.36.2及之前版本存在安全漏洞，该漏洞源于组件Legacy Premium Activation中文件premium.preload.js的函数postMessage，可能导致访问控制不当。

CVSS 5.3 · Medium EPSS 0.56% · P45

Affected Version Matrix 3

VendorProduct Version RangeStatus
eyeo Adblock Plus 4.36.0 affected
4.36.1 affected
4.36.2 affected
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I. Basic Information for CVE-2026-7686

Vulnerability Information
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Vulnerability Title
eyeo Adblock Plus Legacy Premium Activation premium.preload.js postMessage access control
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in eyeo Adblock Plus up to 4.36.2 on Chrome. Affected by this vulnerability is the function postMessage of the file premium.preload.js of the component Legacy Premium Activation. Performing a manipulation results in improper access controls. Remote exploitation of the attack is possible. The exploit has been made public and could be used. Upgrading the affected component is recommended. The vendor provides additional details: "The affected code path is a legacy Premium activation flow that has been deprecated. eyeo has already migrated to a new user account-based licensing system. The exploit does not grant permanent Premium access. The licensing server issues a short-lived trial license (valid for approximately 24 hours) for any submitted userId. On the next license check, the server validates against a real subscription and the trial expires if no valid subscription is found. The researcher's claim of permanently unlocking all Premium features is therefore incorrect. (...) The old flow has been present for years and has not been weaponized at scale to our knowledge. The risk to eyeo and to users is minimal."
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Adblock Plus 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Adblock Plus是Ad-IP开源的一款广告拦截工具。 Adblock Plus 4.36.2及之前版本存在安全漏洞，该漏洞源于组件Legacy Premium Activation中文件premium.preload.js的函数postMessage，可能导致访问控制不当。
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
eyeo Adblock Plus 4.36.0 -

II. Public POCs for CVE-2026-7686

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III. Intelligence Information for CVE-2026-7686

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News Coverage for CVE-2026-7686 (1)

Vendor Pages for CVE-2026-7686 (1)

IV. Related Vulnerabilities

Same weakness: CWE-284

V. Comments for CVE-2026-7686

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