CVE•Published 2023-09-13•Modified 2026-04-08•1 article on news•6 live references•NVD data

CVE-2023-4213Mikevanwinkle · Simplr_registration_form_plus\+

Vulnerability data via NVD (ingested)

CVSS v3.1

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 82% of all CVEs

Weaknesses (CWE)

CWE-639Authorization Bypass Through User-Controlled Key

Description

The Simplr Registration Form Plus+ plugin for WordPress is vulnerable to Insecure Direct Object References in versions up to, and including, 2.4.5. This is due to the plugin providing user-controlled access to objects, letting a user bypass authorization and access system resources. This makes it possible for authenticated attackers with subscriber-level permissions or above to change user passwords and potentially take over administrator accounts.

Timeline

Published 2023-09-13

Modified 2026-04-08

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2023-4213

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · WP plugin path

http.html:"/wp-content/plugins/simplr-registration-form-plus\+/"

Matches any site loading the "simplr-registration-form-plus\+" plugin — doesn't rely on Shodan's vuln tag.

Shodan · product

product:"Mikevanwinkle Simplr Registration Form Plus\+"

All exposed Mikevanwinkle Simplr Registration Form Plus\+ instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Simplr Registration Form Plus\+"

HTTP body or banner mentions "Simplr Registration Form Plus\+" — catches deploys Shodan didn't identify as a product.