CVE-2025-57923

An Insertion of Sensitive Information into Sent Data vulnerability in the Ideal Postcodes UK Address Postcode Validation WordPress plugin exposes the API key, allowing unauthorized third parties to retrieve and reuse the key across any domain. Since API keys are unrestricted by default, with the “Allowed URLs” field left empty upon creation of API key this can lead to unauthorized use and depletion of API credits.Note: the vulnerability is assessed based on the default configuration.This issue affects UK Address Postcode Validation: from n/a through 3.9.2.

Weakness

The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.

Potential Mitigations

• Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
• Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/12.html
• https://cwe.mitre.org/data/definitions/217.html
• https://cwe.mitre.org/data/definitions/612.html
• https://cwe.mitre.org/data/definitions/613.html
• https://cwe.mitre.org/data/definitions/618.html
• https://cwe.mitre.org/data/definitions/619.html
• https://cwe.mitre.org/data/definitions/621.html
• https://cwe.mitre.org/data/definitions/622.html
• https://cwe.mitre.org/data/definitions/623.html

References

• https://patchstack.com/database/wordpress/plugin/uk-address-postcode-validation/vulnerability/wordpress-uk-address-postcode-validation-plugin-3-9-2-sensitive-data-exposure-vulnerability?_s_id=cve