CWE-940
AllowedImproper Verification of Source of a Communication Channel
Abstraction: Base · Status: Incomplete
The product establishes a communication channel to handle an incoming request that has been initiated by an actor, but it does not properly verify that the request is coming from the expected origin.
112 vulnerabilities reference this CWE, most recent first.
GHSA-XQVW-9WJW-5VRV
Vulnerability from github – Published: 2026-10-13 21:36 – Updated: 2026-10-13 21:36Improper verification of source of a communication channel in Windows Hyper-V allows an unauthorized attacker to bypass a security feature over an adjacent network.
{
"affected": [],
"aliases": [
"CVE-2026-87705"
],
"database_specific": {
"cwe_ids": [
"CWE-940"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-13T19:21:23Z",
"severity": "HIGH"
},
"details": "Improper verification of source of a communication channel in Windows Hyper-V allows an unauthorized attacker to bypass a security feature over an adjacent network.",
"id": "GHSA-xqvw-9wjw-5vrv",
"modified": "2026-10-13T21:36:27Z",
"published": "2026-10-13T21:36:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87705"
},
{
"type": "WEB",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87705"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-XV5W-Q5WQ-R3C3
Vulnerability from github – Published: 2025-12-03 21:31 – Updated: 2026-01-30 21:30Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.7_rc1 allows an attacker to open a session from a different IP address which did not initiate the connection resulting in a denial of service for the originating client
{
"affected": [],
"aliases": [
"CVE-2025-13086"
],
"database_specific": {
"cwe_ids": [
"CWE-940"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-03T20:16:24Z",
"severity": "MODERATE"
},
"details": "Improper validation of source IP addresses in OpenVPN version 2.6.0 through 2.7_rc1 allows an attacker to open a session from a different IP address which did not initiate the connection resulting in a denial of service for the originating client",
"id": "GHSA-xv5w-q5wq-r3c3",
"modified": "2026-01-30T21:30:19Z",
"published": "2025-12-03T21:31:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-13086"
},
{
"type": "WEB",
"url": "https://community.openvpn.net/Security%20Announcements/CVE-2025-13086"
},
{
"type": "WEB",
"url": "https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00151.html"
},
{
"type": "WEB",
"url": "https://www.mail-archive.com/openvpn-announce@lists.sourceforge.net/msg00152.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/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",
"type": "CVSS_V4"
}
]
}
Mitigation
- Use a mechanism that can validate the identity of the source, such as a certificate, and validate the integrity of data to ensure that it cannot be modified in transit using an Adversary-in-the-Middle (AITM) attack.
- When designing functionality of actions in the URL scheme, consider whether the action should be accessible to all mobile applications, or if an allowlist of applications to interface with is appropriate.
CAPEC-500: WebView Injection
An adversary, through a previously installed malicious application, injects code into the context of a web page displayed by a WebView component. Through the injected code, an adversary is able to manipulate the DOM tree and cookies of the page, expose sensitive information, and can launch attacks against the web application from within the web page.
CAPEC-594: Traffic Injection
An adversary injects traffic into the target's network connection. The adversary is therefore able to degrade or disrupt the connection, and potentially modify the content. This is not a flooding attack, as the adversary is not focusing on exhausting resources. Instead, the adversary is crafting a specific input to affect the system in a particular way.
CAPEC-595: Connection Reset
In this attack pattern, an adversary injects a connection reset packet to one or both ends of a target's connection. The attacker is therefore able to have the target and/or the destination server sever the connection without having to directly filter the traffic between them.
CAPEC-596: TCP RST Injection
An adversary injects one or more TCP RST packets to a target after the target has made a HTTP GET request. The goal of this attack is to have the target and/or destination web server terminate the TCP connection.