Base weakness
Incomplete
CWE-940: Improper Verification of Source of a Communication Channel
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.
Last updated
44
Recorded CVEs
With this primary weakness
1
KEVs
In the CISA KEV catalog
Not rated
Likelihood of exploit
Per MITRE
Base
Abstraction
MITRE classification
Overview
When an attacker can successfully establish a communication channel from an untrusted origin, the attacker may be able to gain privileges and access unexpected functionality.
Real-world CVEs
44 recorded CVEs are caused by CWE-940 (Improper Verification of Source of a Communication Channel), including 1 in CISA's KEV (Known Exploited Vulnerabilities) catalog. KEVs are shown first. 10 new CWE-940 CVEs have been recorded so far in 2026 (14 in 2025).