CVE-2026-7686
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
A vulnerability was found in eyeo Adblock Plus up to 4.36.2 on Chrome. Affected is the postMessage function in premium.preload.js of the Legacy Premium Activation component. Manipulation results in improper access controls. The exploit has been made public and could be used.
Risk Assessment
An attacker could remotely exploit the vulnerability to gain unauthorized access to Premium features, but according to the vendor the risk is minimal as it involves a deprecated flow and does not grant permanent access.
Recommendation
Update the Adblock Plus extension to the latest version, which includes the new account-based licensing system. The old Premium activation flow has been deprecated.
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Original NVD description (English source)
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."
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

