CVE-2026-3641 (GCVE-0-2026-3641)
Vulnerability from cvelistv5 – Published: 2026-03-21 03:26 – Updated: 2026-04-08 16:59
VLAI
EPSS
VEX
Title
Appmax <= 1.0.3 - Missing Authorization to Order Status Manipulation and Arbitrary Order Creation via Webhook Endpoint
Summary
The 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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-23 17:56 UTC
CWE
- CWE-20 - Improper Input Validation
Assigner
Wordfence
CNA
References
9 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| appmaxplataforma | Appmax |
Affected:
0 , ≤ 1.0.3
(semver)
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-3641",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-23T17:56:07.823644Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-23T17:56:44.655Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Appmax",
"vendor": "appmaxplataforma",
"versions": [
{
"lessThanOrEqual": "1.0.3",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Yoschanin Pulsirivong"
},
{
"lang": "en",
"type": "finder",
"value": "Ronnachai Sretawat Na Ayutaya"
},
{
"lang": "en",
"type": "finder",
"value": "Ronnachai Chaipha"
}
],
"descriptions": [
{
"lang": "en",
"value": "The 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 \u0027event\u0027 and \u0027data\u0027 parameters without verifying the webhook\u0027s 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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "CWE-20 Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-04-08T16:59:07.371Z",
"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"shortName": "Wordfence"
},
"references": [
{
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/6bf61bb7-f977-4afe-bb81-e6de12e00b03?source=cve"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/core/class-appmax-payments-webhook.php#L18"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/core/class-appmax-payments-webhook.php#L18"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/core/class-appmax-payments-webhook.php#L28"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/core/class-appmax-payments-webhook.php#L28"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/webhooks/class-appmax-payments-webhook-events.php#L103"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/webhooks/class-appmax-payments-webhook-events.php#L103"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/webhooks/types/class-appmax-payments-order-paid.php#L56"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/webhooks/types/class-appmax-payments-order-paid.php#L56"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-03-20T15:10:42.000Z",
"value": "Disclosed"
}
],
"title": "Appmax \u003c= 1.0.3 - Missing Authorization to Order Status Manipulation and Arbitrary Order Creation via Webhook Endpoint"
}
},
"cveMetadata": {
"assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"assignerShortName": "Wordfence",
"cveId": "CVE-2026-3641",
"datePublished": "2026-03-21T03:26:50.140Z",
"dateReserved": "2026-03-06T16:04:14.223Z",
"dateUpdated": "2026-04-08T16:59:07.371Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-3641",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-23T17:56:07.823644Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-23T17:56:33.489Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Appmax",
"vendor": "appmaxplataforma",
"versions": [
{
"lessThanOrEqual": "1.0.3",
"status": "affected",
"version": "*",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Yoschanin Pulsirivong"
},
{
"lang": "en",
"type": "finder",
"value": "Ronnachai Sretawat Na Ayutaya"
},
{
"lang": "en",
"type": "finder",
"value": "Ronnachai Chaipha"
}
],
"descriptions": [
{
"lang": "en",
"value": "The 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 \u0027event\u0027 and \u0027data\u0027 parameters without verifying the webhook\u0027s 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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-20",
"description": "CWE-20 Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-21T03:26:50.140Z",
"orgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"shortName": "Wordfence"
},
"references": [
{
"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/6bf61bb7-f977-4afe-bb81-e6de12e00b03?source=cve"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/core/class-appmax-payments-webhook.php#L18"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/core/class-appmax-payments-webhook.php#L18"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/core/class-appmax-payments-webhook.php#L28"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/core/class-appmax-payments-webhook.php#L28"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/webhooks/class-appmax-payments-webhook-events.php#L103"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/webhooks/class-appmax-payments-webhook-events.php#L103"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/trunk/includes/webhooks/types/class-appmax-payments-order-paid.php#L56"
},
{
"url": "https://plugins.trac.wordpress.org/browser/appmax/tags/1.0.3/includes/webhooks/types/class-appmax-payments-order-paid.php#L56"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-03-20T15:10:42.000Z",
"value": "Disclosed"
}
],
"title": "Appmax \u003c= 1.0.3 - Missing Authorization to Order Status Manipulation and Arbitrary Order Creation via Webhook Endpoint"
}
},
"cveMetadata": {
"assignerOrgId": "b15e7b5b-3da4-40ae-a43c-f7aa60e62599",
"assignerShortName": "Wordfence",
"cveId": "CVE-2026-3641",
"datePublished": "2026-03-21T03:26:50.140Z",
"dateReserved": "2026-03-06T16:04:14.223Z",
"dateUpdated": "2026-03-23T17:56:44.655Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.