Medium 5.3Published May 3, 2026

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

Updated under an hour ago (Oct 27, 2026, 4:23 AM ET)

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It affects eyeo Adblock Plus. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for eyeo Adblock Plus

Exploited in the last 30 days

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."

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
Weakness (CWE): CWE-284, 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: May 4, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

eyeo Adblock Plus eyeo:adblock_plus (from the name)	4.36.0; 4.36.1; 4.36.2	CNA record

References

References

https://vuldb.com/vuln/360856	vdb-entry, technical-description
https://vuldb.com/vuln/360856/cti	signature, permissions-required
https://vuldb.com/submit/793551	third-party-advisory
https://github.com/xryj920/CVE/blob/main/adblock_plus_CVE_report.md	exploit
https://adblockplus.org/en/download	patch

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.