| Title | Eyeo GmbH Adblock Plus 4.36.2 Privilege Escalation |
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| Description | A missing origin validation in premium.preload.js allows any JavaScript
running in the context of accounts.adblockplus.org to forge a
payment_success postMessage event and activate the Premium subscription
without payment. The extension background (background.js) further fails
to bind the submitted userId to a verified payment session before
persisting it and initiating license_check. Tested on v4.36.2,
reproducible in ~30 seconds with a single line of JavaScript. |
|---|
| Source | ⚠️ https://github.com/xryj920/CVE/blob/main/adblock_plus_CVE_report.md |
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| User | DRXYJ (UID 46872) |
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| Submission | 03/31/2026 11:44 (3 months ago) |
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| Moderation | 05/02/2026 18:03 (1 month later) |
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| Status | Accepted |
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| VulDB entry | 360856 [eyeo Adblock Plus up to 4.36.2 on Chrome Legacy Premium Activation premium.preload.js postMessage access control] |
|---|
| Points | 20 |
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