Simplr Registration Form Plus+ <= 2.4.5 - Authenticated (Subscriber+) Insecure Direct Object Reference to Arbitrary User Password Change
Strategic Overview
- Status
- Unpatched
- Affected Plugin
- Simplr Registration Form Plus+
- Affected Version
<= 2.4.5- CVSS
- 8.8High
- Weakness type
- CWE-639 · Authorization Bypass Through User-Controlled Key
- CVE
CVE-2023-4213
At a glance
CVE-2023-4213 is a high-severity Authorization Bypass Through User-Controlled Key vulnerability in the Simplr Registration Form Plus+ WordPress plugin, affecting versions <= 2.4.5. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account at Subscriber level or above. No fixed release has been reported yet; treat installations running this software as exposed. Disclosed September 2023, reported by István Márton.
Vulnerability Overview
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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.
CWE-639: Authorization Bypass Through User-Controlled Key
Reaching this weakness in Simplr Registration Form Plus+ <= 2.4.5 takes an account at Subscriber level or above. Authorization bypass through a user-controlled key, often called insecure direct object reference, means the application looks up a record by an identifier from the request without checking that the caller owns it.
Changing a number in the request is enough to read or modify other users' records, which on commerce and membership sites means customer data. No fixed build of this plugin is recorded for Simplr Registration Form Plus+ yet, so installs running <= 2.4.5 stay exposed until the vendor ships one.
Remediation
No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
How does WordSec protect against this?
Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. No patched version is recorded yet, which is the case where a filtering layer matters most, because there is nothing to update to.
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Simplr Registration Form Plus+
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C