Understanding and Defending Against Stored Cross-Site Scripting (XSS) in OpenCATS
This educational analysis delves into CVE-2026-115513, a stored cross-site scripting (XSS) vulnerability in OpenCATS versions before 0.12.0. The vulnerability allows a low-privileged authenticated user to inject malicious HTML/JavaScript payloads, potentially leading to session/cookie theft and privilege escalation to full administrative control. We will explore the root cause, attack surface, exploitation mechanics, real-world impact, and defensive strategies to protect against this threat.