CVE-2026-7686: Improper Access Controls in eyeo Adblock Plus
CVE-2026-7686 is a medium-severity vulnerability in eyeo Adblock Plus versions up to 4. 36. 2 on Chrome. It involves improper access controls in the legacy Premium activation flow, specifically in the postMessage function of premium. preload. js. The vulnerability allows remote manipulation that can temporarily grant a short-lived trial license for Premium features, valid for about 24 hours. However, this does not result in permanent Premium access, as the licensing server validates subscriptions on subsequent checks and expires unauthorized trials. The affected legacy flow has been deprecated and replaced by a new user account-based licensing system. The vendor notes minimal risk and no known large-scale exploitation.
AI Analysis
Technical Summary
This vulnerability affects the legacy Premium activation mechanism in eyeo Adblock Plus up to version 4.36.2 on Chrome. The issue lies in improper access controls in the postMessage function within premium.preload.js, allowing remote attackers to manipulate the licensing process. Exploitation results in issuance of a short-lived trial license (~24 hours) for any submitted userId, but permanent Premium access is not granted due to server-side subscription validation. The legacy activation flow is deprecated and replaced by a new licensing system. The vendor states the risk is minimal and no large-scale exploitation is known. No official patch or remediation level is currently documented.
Potential Impact
The vulnerability allows remote attackers to temporarily obtain a trial Premium license for Adblock Plus without a valid subscription. This trial license lasts approximately 24 hours before the licensing server revokes it upon validation failure. The exploit does not enable permanent unauthorized access to Premium features. The legacy activation flow affected is deprecated and poses minimal risk to users and the vendor. There is no evidence of widespread exploitation.
Mitigation Recommendations
No official patch or remediation level has been provided by the vendor. The vendor recommends upgrading to versions that use the new user account-based licensing system, which is not affected by this vulnerability. Since the legacy flow is deprecated and the risk is minimal, no urgent action is required beyond upgrading to a supported version. Monitor vendor advisories for any future updates.
CVE-2026-7686: Improper Access Controls in eyeo Adblock Plus
Description
CVE-2026-7686 is a medium-severity vulnerability in eyeo Adblock Plus versions up to 4. 36. 2 on Chrome. It involves improper access controls in the legacy Premium activation flow, specifically in the postMessage function of premium. preload. js. The vulnerability allows remote manipulation that can temporarily grant a short-lived trial license for Premium features, valid for about 24 hours. However, this does not result in permanent Premium access, as the licensing server validates subscriptions on subsequent checks and expires unauthorized trials. The affected legacy flow has been deprecated and replaced by a new user account-based licensing system. The vendor notes minimal risk and no known large-scale exploitation.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects the legacy Premium activation mechanism in eyeo Adblock Plus up to version 4.36.2 on Chrome. The issue lies in improper access controls in the postMessage function within premium.preload.js, allowing remote attackers to manipulate the licensing process. Exploitation results in issuance of a short-lived trial license (~24 hours) for any submitted userId, but permanent Premium access is not granted due to server-side subscription validation. The legacy activation flow is deprecated and replaced by a new licensing system. The vendor states the risk is minimal and no large-scale exploitation is known. No official patch or remediation level is currently documented.
Potential Impact
The vulnerability allows remote attackers to temporarily obtain a trial Premium license for Adblock Plus without a valid subscription. This trial license lasts approximately 24 hours before the licensing server revokes it upon validation failure. The exploit does not enable permanent unauthorized access to Premium features. The legacy activation flow affected is deprecated and poses minimal risk to users and the vendor. There is no evidence of widespread exploitation.
Mitigation Recommendations
No official patch or remediation level has been provided by the vendor. The vendor recommends upgrading to versions that use the new user account-based licensing system, which is not affected by this vulnerability. Since the legacy flow is deprecated and the risk is minimal, no urgent action is required beyond upgrading to a supported version. Monitor vendor advisories for any future updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-05-02T16:03:17.517Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69f701fecbff5d8610ceebcb
Added to database: 5/3/2026, 8:06:22 AM
Last enriched: 5/3/2026, 8:21:19 AM
Last updated: 5/3/2026, 9:07:38 AM
Views: 3
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