Base weakness
Draft
CWE-471: Modification of Assumed-Immutable Data (MAID)
The product does not properly protect an assumed-immutable element from being modified by an attacker.
Last updated
31
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
This occurs when a particular input is critical enough to the functioning of the application that it should not be modifiable at all, but it is. Certain resources are often assumed to be immutable when they are not, such as hidden form fields in web applications, cookies, and reverse DNS lookups.
Real-world CVEs
31 recorded CVEs are caused by CWE-471 (Modification of Assumed-Immutable Data (MAID)). The highest-severity and most recent are shown first. 1 new CWE-471 CVE has been recorded so far in 2026 (5 in 2025).