What is CVE-2021-4428?

CVE-2021-4428 is a low-severity vulnerability in What3words Autosuggest, classified under Information Disclosure. CVSS score: 2.7/10. Published 2023-07-18.

How severe is CVE-2021-4428?

Low severity. CVSS v3 base score is 2.7 out of 10.

Is CVE-2021-4428 known to be exploited?

25 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in What3words Autosuggest

CVE-2021-4428

A vulnerability has been found in what3words Autosuggest Plugin up to 4.0.0 on WordPress and classified as problematic. Affected by this vulnerability is the function enqueue_scripts of the file w3w-autosuggest/public/class-w3w-autosuggest-public.php of the component Setting Handler. The manipulation leads to information disclosure. The attack can be launched remotely. Upgrading to version 4.0.1 is able to address this issue. The patch is named dd59cbac5f86057d6a73b87007c08b8bfa0c32ac. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-234247.

Vulnerability class: Information Disclosure

Published 2023-07-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.158 (96.8th percentile), scored 2026-10-02.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.158 · newest: 0.158 · change: 0.000

Affected products

What3words Autosuggest
What3words Autosuggest Plugin — versions 4.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

Public proof-of-concept exploits

References

vuldb.com/ (Permissions Required, technical-description, vdb-entry)
vuldb.com/ (signature, Permissions Required, permissions-required)
github.com/what3words/wordpress-autosuggest-plugin/pull/20 (issue-tracking, Patch, Vendor Advisory)
github.com/what3words/wordpress-autosuggest-plugin/commit/dd59cbac5f86057d6a73b… (Patch, patch)
github.com/what3words/wordpress-autosuggest-plugin/releases/tag/v4.0.1 (Release Notes, patch)

Frequently asked questions

What is CVE-2021-4428?: CVE-2021-4428 is a low-severity vulnerability in What3words Autosuggest, classified under Information Disclosure. CVSS score: 2.7/10. Published 2023-07-18.
How severe is CVE-2021-4428?: Low severity. CVSS v3 base score is 2.7 out of 10.
Is CVE-2021-4428 known to be exploited?: 25 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.