CVE-2026-7686
Full vulnerability record from the local CVENow database.
Description
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."
Severity
MEDIUM
CVSS score
5.5
(v4.0)
Vulnerability status
Deferred
Source identifier
Published
2026-05-03 08:16:01.073000
Last modified
2026-10-26 20:10:00.160000
View original CVE JSON
{
"id": "CVE-2026-7686",
"sourceIdentifier": "[email protected]",
"published": "2026-05-03T08:16:01.073",
"lastModified": "2026-10-26T20:10:00.160",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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.\""
},
{
"lang": "es",
"value": "Se encontró una vulnerabilidad en eyeo Adblock Plus hasta la versión 4.36.2 en Chrome. Afectada por esta vulnerabilidad es la función postMessage del archivo premium.preload.js del componente Legacy Premium Activation. Realizar una manipulación resulta en controles de acceso inadecuados. La explotación remota del ataque es posible. El exploit ha sido hecho público y podría ser usado. Se recomienda actualizar el componente afectado. El proveedor proporciona detalles adicionales: ’La ruta de código afectada es un flujo de activación Premium heredado que ha sido desaprobado. eyeo ya ha migrado a un nuevo sistema de licencias basado en cuentas de usuario. El exploit no otorga acceso Premium permanente. El servidor de licencias emite una licencia de prueba de corta duración (válida por aproximadamente 24 horas) para cualquier userId enviado. En la siguiente verificación de licencia, el servidor valida contra una suscripción real y la prueba expira si no se encuentra una suscripción válida. La afirmación del investigador de desbloquear permanentemente todas las funciones Premium es, por lo tanto, incorrecta. (...) El flujo antiguo ha estado presente durante años y no ha sido utilizado como arma a gran escala, que sepamos. El riesgo para eyeo y para los usuarios es mínimo.’"
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "eyeo",
"product": "Adblock Plus",
"modules": [
"Legacy Premium Activation"
],
"versions": [
{
"version": "4.36.0",
"status": "affected"
},
{
"version": "4.36.1",
"status": "affected"
},
{
"version": "4.36.2",
"status": "affected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV40": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "4.0",
"vectorString": "CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "PROOF_OF_CONCEPT",
"confidentialityRequirement": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"availabilityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED"
}
}
],
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"availabilityImpact": "NONE"
},
"exploitabilityScore": 3.9,
"impactScore": 1.4
}
],
"cvssMetricV2": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "2.0",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
"baseScore": 5.0,
"accessVector": "NETWORK",
"accessComplexity": "LOW",
"authentication": "NONE",
"confidentialityImpact": "NONE",
"integrityImpact": "PARTIAL",
"availabilityImpact": "NONE"
},
"baseSeverity": "MEDIUM",
"exploitabilityScore": 10.0,
"impactScore": 2.9,
"acInsufInfo": false,
"obtainAllPrivilege": false,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-05-04T15:02:15.880067Z",
"id": "CVE-2026-7686",
"options": [
{
"exploitation": "poc"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-266"
},
{
"lang": "en",
"value": "CWE-284"
}
]
}
],
"references": [
{
"url": "https://adblockplus.org/en/download",
"source": "[email protected]"
},
{
"url": "https://github.com/xryj920/CVE/blob/main/adblock_plus_CVE_report.md",
"source": "[email protected]"
},
{
"url": "https://vuldb.com/submit/793551",
"source": "[email protected]"
},
{
"url": "https://vuldb.com/vuln/360856",
"source": "[email protected]"
},
{
"url": "https://vuldb.com/vuln/360856/cti",
"source": "[email protected]"
}
]
}