Vulnerability 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 users and changing application settings. This flaw could be exploited to ultimately provide full control of the affected system to the attacker.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Wpo365 | Wordpress \+ Azure Ad \/ Microsoft Office 365 | <= 15.3 |
Related Weaknesses (CWE)
References
- https://appcheck-ng.com/wordpress-microsoft-office-365-azure-ad-login-persistentExploitThird Party Advisory
- https://www.wpo365.com/change-log/Release NotesVendor Advisory
- https://appcheck-ng.com/wordpress-microsoft-office-365-azure-ad-login-persistentExploitThird Party Advisory
- https://www.wpo365.com/change-log/Release NotesVendor Advisory
FAQ
What is CVE-2021-43409?
CVE-2021-43409 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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)...
How severe is CVE-2021-43409?
CVE-2021-43409 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-43409?
Check the references section above for vendor advisories and patch information. Affected products include: Wpo365 Wordpress \+ Azure Ad \/ Microsoft Office 365.