TI-2021-03282 Aliases CVE-2021-4425 GHSA-wmpx-27x6-m5w5

Defender Security <= 2.4.6 - Cross-Site Request Forgery Bypass

LOW 21CWE-352Published 2023-07-12 · Updated 2026-04-08

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Tampering
Confidentiality · integrity · availability: None · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-352.

Summary

The Defender Security plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.4.6. This is due to missing or incorrect nonce validation on the verify_otp_login_time() function. This makes it possible for unauthenticated attackers to verify a one time login via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00563 47th percentileScored 2026-11-07

Public exploit Yes 8 exploit referencesTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
wpmudev	Defender Security – Malware Scanner, Login Security & Firewall	up to 2.4.6	—	No fix listed	CNA

Defender Security – Malware Scanner, Login Security & Firewall Vendorwpmudev Affected up to 2.4.6 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:wpmudev:defender_security::::::wordpress::*	up to 2.4.6	Vulnerable	wpmudev

cpe:2.3:a:wpmudev:defender_security:*:*:*:*:*:wordpress:*:* Versions up to 2.4.6 Vulnerable ·wpmudev

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-4425
2026-10-03 Alias added: GHSA-wmpx-27x6-m5w5

References

Exploit 8

Patch 1

https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2473684%40defender-security&new=2473684%40defender-security&sfp_email=&sfph_mail=

TI-2023-04683 Defender Security < 4.1.0 - Protection Bypass (Hidden Login Page) CVSS 3.1MEDIUM 5.3
TI-2023-28142 WordPress Defender Security Plugin <= 4.1.0 is vulnerable to Sensitive Data Exposure CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences