CVE-2025-57923Network attack vector

API-key disclosure via unrestricted client-side exposure

Published Sep 22, 2025 · Updated Apr 28, 2026

Sensitive-data exposure in Ideal Postcodes UK Address Postcode Validation 3.9.2 and earlier allows remote attackers to obtain its API key. The plugin places the configured public API key in data sent to unauthenticated storefront clients, where it can be copied and reused from another domain. Default keys have an empty Allowed URLs restriction, so exposed keys can be used without authentication to consume the account's lookup credits.

CVSS severity5.3
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive-data exposure in Ideal Postcodes UK Address Postcode Validation 3.9.2 and earlier allows remote attackers to obtain its API key. The plugin places the configured public API key in data sent to unauthenticated storefront clients, where it can be copied and reused from another domain. Default keys have an empty Allowed URLs restriction, so exposed keys can be used without authentication to consume the account's lookup credits.

The record

CVE
CVE-2025-57923
Published
Sep 22, 2025
Updated
Apr 28, 2026
Vendor
Ideal Postcodes
Product
UK Address Postcode Validation
Classifications
CWE-201, T1552
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.9.2 changes=[{"at":"3.10.0","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ideal Postcodes · UK Address Postcode Validationversion=0 <=3.9.2 changes=[{"at":"3.10.0","status":"unaffected"}]

Published CVSS scores

5.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-201Insertion of Sensitive Information Into Sent Data
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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