CVE-2021-43409
9.3 · CRITICALOverview
CVE-2021-43409 is a critical-severity vulnerability affecting wpo365 wordpress_\+_azure_ad_\/_microsoft_office_365. It was published on November 19, 2021 and has a CVSS 3.1 base score of 9.3 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
The “WPO365 | LOGIN” WordPress plugin (up to and including version 15.3) by wpo365.com is vulnerable to a persistent Cross-Site Scripting (XSS) vulnerability (also known as Stored or Second-Order XSS). Persistent XSS vulnerabilities occur when the application stores and retrieves client supplied data without proper handling of dangerous content. This type of XSS vulnerability is exploited by submitting malicious script content to the application which is then retrieved and executed by other application users. The attacker could exploit this to conduct a range of attacks against users of the affected application such as session hijacking, account take over and accessing sensitive data. In this case, the XSS payload can be submitted by any anonymous user, the payload then renders and executes when a WordPress administrator authenticates and accesses the WordPress Dashboard. The injected payload can carry out actions on behalf of the administrator including adding other administrative use
Remediation
Check the references section for vendor advisories and patches from wpo365. Update wordpress_\+_azure_ad_\/_microsoft_office_365 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| wpo365 | wordpress_\+_azure_ad_\/_microsoft_office_365 | 0 | Affected |
Frequently Asked Questions
What is CVE-2021-43409?
CVE-2021-43409 is a critical-severity vulnerability affecting wpo365 wordpress_\+_azure_ad_\/_microsoft_office_365. It was published on November 19, 2021 and has a CVSS 3.1 base score of 9.3 (CRITICAL).
How severe is CVE-2021-43409?
This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-43409?
Check the references section for vendor advisories and patches from wpo365. Update wordpress_\+_azure_ad_\/_microsoft_office_365 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-43409?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-43409 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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