CWE-235: Improper Handling of Extra Parameters
The product does not handle or incorrectly handles when the number of parameters, fields, or arguments with the same name exceeds the expected amount.
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Overview
CWE-235 (Improper Handling of Extra Parameters) is a variant-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
4 recorded CVEs are caused by CWE-235 (Improper Handling of Extra Parameters). The highest-severity and most recent are shown first. 2 new CWE-235 CVEs have been recorded so far in 2026.
Common consequences
What can happen when CWE-235 is exploited.
Unexpected State
Affects: Integrity
How it happens
When it is introduced
Typically introduced during these phases of the software lifecycle.
Illustrative examples
Real CVEs that MITRE cites as examples of this weakness.
- CVE-2003-1014 — MIE. multiple gateway/security products allow restriction bypass using multiple MIME fields with the same name, which are interpreted differently by clients.
Terminology & mappings
Mapped taxonomies
- PLOVER: Extra Parameter Error
Attack patterns
CAPEC attack patterns that exploit this weakness.
Frequently asked questions
Common questions about CWE-235.
- What is CWE-235?
- The product does not handle or incorrectly handles when the number of parameters, fields, or arguments with the same name exceeds the expected amount.
- What CVEs are caused by CWE-235?
- 4 recorded CVEs are attributed to CWE-235, including CVE-2017-20160, CVE-2026-27851, CVE-2024-47651.
- What are the consequences of CWE-235?
- Exploiting CWE-235 can lead to: Unexpected State.
- Is CWE-235 actively exploited?
- 4 recorded CVEs are caused by CWE-235; none are currently in CISA's KEV catalog of actively exploited flaws.
References
- MITRE CWE definition (CWE-235) (opens in a new tab)
- CWE-235 vulnerabilities on NVD (opens in a new tab)
- Learn: What is a CWE?
Weakness data is sourced from the MITRE CWE catalog (v4.20). CVE associations are aggregated and kept current by RadicalNotion.AI.
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