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.
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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).