CVE-2021-43409 WPO365 | LOGIN - Wordpress Plugin Persistent Cross-Site Scripting
An anonymous user can inject persistent XSS payloads that execute when an administrator views the dashboard, potentially leading to full system compromise.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-43409?
CVE-2021-43409 is a critical cross-site scripting vulnerability in wpo365.com WordPress + Microsoft Office 365 / Azure AD | LOGIN, published on 19 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2021-43409?
It affects 1 product.
Products include Wpo365 Wordpress \+ Azure Ad \/ Microsoft Office 365.
How do I fix CVE-2021-43409?
No fix has been published for CVE-2021-43409 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2021-43409 being exploited?
There is no known exploitation of CVE-2021-43409 in the wild and no public exploit code.
Other vulnerabilities in wpo365.com WordPress + Microsoft Office 365 / Azure AD | LOGIN
Sources
Also known as GHSA-px36-5x6h-5x8g.