CWE-156 (Improper Neutralization of Whitespace) documents a weakness type used across vulnerability databases and security assessments. Use the sections below for definition, context, and mapped CVEs.
The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as whitespace when they are sent to a downstream component.
| Kind | Name | Class | Prevalence | OS / CPE |
|---|---|---|---|---|
| language | — | Not Language-Specific | Undetermined | — |
These CVEs are mapped to this weakness in this database and kept for traceability and search.
| CVE | Published | Summary |
|---|---|---|
| CVE-2025-55127 | 2025-11-20 | HackerOne community member Dao Hoang Anh (yoyomiski) has reported an improper neutralization of whitespace in the username when adding new users. A username with leading or trailing whitespace could b… |
| CVE-2025-55001 | 2025-08-09 | OpenBao exists to provide a software solution to manage, store, and distribute sensitive data including secrets, certificates, and keys. In versions 2.3.1 and below, OpenBao allowed the assignment of … |
| CVE-2025-55000 | 2025-08-09 | OpenBao exists to provide a software solution to manage, store, and distribute sensitive data including secrets, certificates, and keys. In versions 0.1.0 through 2.3.1, OpenBao's TOTP secrets engine … |
| CVE-2025-6013 | 2025-08-06 | Vault and Vault Enterprise’s (“Vault”) ldap auth method may not have correctly enforced MFA if username_as_alias was set to true and a user had multiple CNs that are equal but with leading or trailing… |
| CVE-2025-6014 | 2025-08-01 | Vault and Vault Enterprise’s (“Vault”) TOTP Secrets Engine code validation endpoint is susceptible to code reuse within its validity period. Fixed in Vault Community Edition 1.20.1 and Vault Enterpris… |
| Date | Name | Version | Importance | Comment |
|---|---|---|---|---|
| 2008-07-01 | Eric Dalci | 1.0 | — | updated Potential_Mitigations, Time_of_Introduction |
| 2008-09-08 | CWE Content Team | 1.0 | — | updated Description, Relationships, Relationship_Notes, Taxonomy_Mappings |
| 2009-03-10 | CWE Content Team | 1.3 | — | updated Description, Name |
| 2009-07-27 | CWE Content Team | 1.5 | — | updated Potential_Mitigations |
| 2010-04-05 | CWE Content Team | 1.8.1 | — | updated Description, Name |
| 2011-03-29 | CWE Content Team | 1.12 | — | updated Potential_Mitigations |
| 2011-06-01 | CWE Content Team | 1.13 | — | updated Common_Consequences |
| 2011-06-27 | CWE Content Team | 2.0 | — | updated Common_Consequences |
| 2012-05-11 | CWE Content Team | 2.2 | — | updated Relationships |
| 2012-10-30 | CWE Content Team | 2.3 | — | updated Potential_Mitigations |
| 2014-07-30 | CWE Content Team | 2.8 | — | updated Relationships, Taxonomy_Mappings |
| 2017-05-03 | CWE Content Team | 2.11 | — | updated Potential_Mitigations |
| 2017-11-08 | CWE Content Team | 3.0 | — | updated Applicable_Platforms |
| 2020-02-24 | CWE Content Team | 4.0 | — | updated Potential_Mitigations, Relationships |
| 2020-06-25 | CWE Content Team | 4.1 | — | updated Potential_Mitigations |
| 2023-01-31 | CWE Content Team | 4.10 | — | updated Description, Potential_Mitigations |
| 2023-04-27 | CWE Content Team | 4.11 | — | updated Relationships |
| 2023-06-29 | CWE Content Team | 4.12 | — | updated Mapping_Notes |
| 2025-12-11 | CWE Content Team | 4.19 | — | updated Weakness_Ordinalities |