Appmax <= 1.0.3 - Missing Authorization to Order Status Manipulation and Arbitrary Order Creation via Webhook Endpoint

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Summary

CVECVE-2026-3641
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-21 04:17:31 UTC
Updated2026-04-24 16:27:44 UTC
DescriptionThe Appmax plugin for WordPress is vulnerable to Improper Input Validation in all versions up to, and including, 1.0.3. This is due to the plugin registering a public REST API webhook endpoint at /webhook-system without implementing webhook signature validation, secret verification, or any mechanism to authenticate that incoming webhook requests genuinely originate from the legitimate Appmax payment service. The plugin directly processes untrusted attacker-controlled input from the 'event' and 'data' parameters without verifying the webhook's authenticity. This makes it possible for unauthenticated attackers to craft malicious webhook payloads that can modify the status of existing WooCommerce orders (e.g., changing them to processing, refunded, cancelled, or pending), create entirely new WooCommerce orders with arbitrary data, create new WooCommerce products with attacker-controlled names/descriptions/prices, and write arbitrary values to order post metadata by spoofing legitimate webhook events.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.001270000 probability, percentile 0.317720000 (date 2026-04-26)

Problem Types: CWE-20 | CWE-20 CWE-20 Improper Input Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Appmaxplataforma Appmax affected 1.0.3 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/core/class-appmax-payments... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/appmax/trunk/includes/webhooks/types/class-appmax-pay... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/core/class-appmax-payments... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/appmax/trunk/includes/webhooks/class-appmax-payments-... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/webhooks/class-appmax-paym... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/webhooks/types/class-appma... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/appmax/trunk/includes/core/class-appmax-payments-webh... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/appmax/trunk/includes/core/class-appmax-payments-webh... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/6bf61bb7-f977-4afe-bb81-e6de1... [email protected] www.wordfence.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Yoschanin Pulsirivong (en)

CNA: Ronnachai Sretawat Na Ayutaya (en)

CNA: Ronnachai Chaipha (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-03-20T15:10:42.000ZDisclosed
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