How severe is CVE-2023-4213?

CVE-2023-4213 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-4213 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-4213?

CVE-2023-4213 affects Mikevanwinkle Simplr Registration Form Plus+. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-4213?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-4213 published?

CVE-2023-4213 was published on 2023-09-13 and last updated on 2026-06-17.

CVE-2023-4213

CVE-2023-4213 is a high-severity vulnerability in Mikevanwinkle Simplr Registration Form Plus+ with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-639.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-639
Affected product: Mikevanwinkle Simplr Registration Form Plus+
Published: 2023-09-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-4213?: 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.
How severe is CVE-2023-4213?: CVE-2023-4213 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-4213 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-4213?: CVE-2023-4213 affects Mikevanwinkle Simplr Registration Form Plus+. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-4213?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-4213 published?: CVE-2023-4213 was published on 2023-09-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mikevanwinkle:simplr_registration_form_plus\+:*:*:*:*:*:wordpress:*:*

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