CVE-2026-7686Public exploitNetwork attack vector

Temporary Premium access via unchecked postMessage origin

Published May 3, 2026 · Updated May 3, 2026

Improper access control in eyeo Adblock Plus 4.36.0 through 4.36.2 for Chrome allows attackers to obtain temporary Premium access. The premium.preload.js message handler accepts a payment_success postMessage without validating its origin, and the background activation path stores an unbound userId before requesting a license. Code running on an Adblock Plus account page can trigger a trial license lasting about 24 hours; the next server check rejects it without a subscription.

CVSS severity5.3
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper access control in eyeo Adblock Plus 4.36.0 through 4.36.2 for Chrome allows attackers to obtain temporary Premium access. The premium.preload.js message handler accepts a payment_success postMessage without validating its origin, and the background activation path stores an unbound userId before requesting a license. Code running on an Adblock Plus account page can trigger a trial license lasting about 24 hours; the next server check rejects it without a subscription.

The record

CVE
CVE-2026-7686
Published
May 3, 2026
Updated
May 3, 2026
Vendor
eyeo
Product
Adblock Plus
Classifications
CWE-284, CWE-266
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 2026CVE publishedPublication date reported by the CVE source.
  2. May 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.36.0
  2. Affected versionversion=4.36.1
  3. Affected versionversion=4.36.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

eyeo · Adblock Plusversion=4.36.0; version=4.36.1; version=4.36.2

Published CVSS scores

5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
5.0VulDBAV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-266Incorrect Privilege Assignment

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo