Base weakness
Draft
CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data
The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted.
Last updated
32
Recorded CVEs
With this primary weakness
0
KEVs
In the CISA KEV catalog
Not rated
Likelihood of exploit
Per MITRE
Base
Abstraction
MITRE classification
Overview
CWE-349 (Acceptance of Extraneous Untrusted Data With Trusted Data) is a base-level software weakness catalogued by MITRE in the Common Weakness Enumeration (CWE). It describes a recurring type of mistake that can lead to exploitable security vulnerabilities.
Real-world CVEs
32 recorded CVEs are caused by CWE-349 (Acceptance of Extraneous Untrusted Data With Trusted Data). The highest-severity and most recent are shown first. 5 new CWE-349 CVEs have been recorded so far in 2026 (12 in 2025).