Critical · published January 8, 2026
🚨 An attacker can impersonate any user—yes, even administrators—just by sending a bad HTTP header! This authentication bypass in Kanboard is a ticking time bomb waiting to explode! 🔥 Think of it like a front desk at a hotel that lets anyone check in just by saying they're someone else—no ID needed. This kind of trust can lead to some serious trouble for your data and operations! If exploited, this vulnerability can allow an attacker to take over user accounts, including those with administrative privileges, leading to unauthorized access to sensitive project information. Imagine a rogue actor wreaking havoc by altering project plans or deleting crucial tasks—absolutely devastating!
Think of it like a front desk at a hotel that lets anyone check in just by saying they're someone else—no ID needed. This kind of trust can lead to some serious trouble for your data and operations! This critical authentication bypass occurs when the REVERSE_PROXY_AUTH option is enabled, allowing the application to blindly trust incoming HTTP headers for user authentication without verifying they come from a secure source.
If exploited, this vulnerability can allow an attacker to take over user accounts, including those with administrative privileges, leading to unauthorized access to sensitive project information. Imagine a rogue actor wreaking havoc by altering project plans or deleting crucial tasks—absolutely devastating! To protect your Kanboard installation, upgrade to version 1.2.49 immediately. Also, review your reverse proxy configuration to ensure that it properly validates user headers. This is essential for keeping your project management fortress secure! You've got this! 🎉 Follow these steps, and you'll have your application secured in no time! 🛡️