TL;DR 📌

A high-severity HTML injection vulnerability has been identified in the Cisco Secure Firewall Management Center (FMC) Software. This flaw allows authenticated remote attackers to inject arbitrary HTML content into device-generated documents, potentially leading to sensitive information exposure. Cisco has released updates to address this issue, but there are no workarounds available.

What happened 🕵️‍♂️

A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center Software could allow an authenticated, remote attacker to inject arbitrary HTML content into a device-generated document. This vulnerability arises from improper validation of user-supplied data. An attacker with valid credentials (at least Security Analyst role) could exploit this vulnerability to alter document layouts, read arbitrary files from the underlying operating system, and conduct server-side request forgery (SSRF) attacks.