MSMC Redirect After Comment <= 2.1.2 - Cross-Site Request Forgery to Stored Cross-Site Scripting
Strategic Overview
- Status
- Unpatched
- Affected Plugin
- MSMC – Redirect After Comment
- Affected Version
<= 2.1.2- CVSS
- 7.1High
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE pending
At a glance
This record tracks a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the MSMC WordPress plugin, affecting versions <= 2.1.2. It carries a CVSS score of 7.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. No fixed release has been reported yet; treat installations running this software as exposed. Disclosed May 2017, reported by Mallory Adams.
Vulnerability Overview
The MSMC Redirect After Comment plugin for WordPress is vulnerable to Cross-Site Request Forgery to Stored Cross-Site Scripting via the ‘MSMC_redirect_location’ parameter in versions up to, and including, 2.1.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to perform almost any action an admin can if they can successfully trick an admin into performing an action such as clicking on a link.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
MSMC <= 2.1.2 carries this weakness at MSMC_redirect_location, and reaching it takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. No fixed build of this plugin is recorded for MSMC yet, so installs running <= 2.1.2 stay exposed until the vendor ships one.
Remediation
No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
How does WordSec protect against this?
The attempt arrives as an ordinary request to MSMC: WordSec's web application firewall inspects request payloads before WordPress loads them. No patched version is recorded yet, which is the case where a filtering layer matters most, because there is nothing to update to.
- Firewall
- Alerts
External References
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C