CVE-2026-3641Network attack vector

Unauthenticated data manipulation via unsigned webhooks

Published Mar 21, 2026 · Updated Mar 21, 2026

Improper input validation in Appmax WordPress Plugin 1.0.3 and earlier allows remote attackers to alter WooCommerce data via webhooks. The public /webhook-system REST endpoint accepts event and data fields without validating a signature, shared secret, or sender identity. No credentials or user interaction are required, enabling forged events to change order states, create orders or products, and write order metadata.

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

What happened

Improper input validation in Appmax WordPress Plugin 1.0.3 and earlier allows remote attackers to alter WooCommerce data via webhooks. The public /webhook-system REST endpoint accepts event and data fields without validating a signature, shared secret, or sender identity. No credentials or user interaction are required, enabling forged events to change order states, create orders or products, and write order metadata.

The record

CVE
CVE-2026-3641
Published
Mar 21, 2026
Updated
Mar 21, 2026
Vendor
Appmax
Product
Appmax WordPress Plugin
Classifications
CWE-20, T1565.001, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=* <=1.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Appmax · Appmax WordPress Pluginversion=* <=1.0.3

Published CVSS scores

5.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1565.001Stored Data Manipulation
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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