AuthMatrix GUI breaks in Burp Suite 2025.12.3

[Abyssraven0x13]

Description

After upgrading to Burp Suite 2025.12.3, the AuthMatrix extension becomes unusable due to a GUI repaint issue.

The extension loads successfully, but after certain actions the AuthMatrix tab stops repainting and appears frozen.

Steps to reproduce

1. Install Burp Suite 2025.12.3
2. Load the AuthMatrix extension
3. Open the AuthMatrix tab
4. Either:
   • add a user and a request, or
   • import an existing AuthMatrix configuration
5. Observe that the GUI stops repainting

Actual behavior

The AuthMatrix UI becomes partially or fully frozen and cannot be used.

Expected behavior

The GUI should remain responsive and repaint correctly.

Error details

The following exception is repeatedly logged during table repaint:

AttributeError: 'com.formdev.flatlaf.ui.FlatTableUI$FlatBooleanRend' object has no attribute 'setSelected'

[Abyssraven0x13]

Update: a working fix for the GUI freeze issue in Burp Suite 2025.x has been implemented in a PR here: earth11411#1

[bad-antics]

GUI issues in newer Burp versions are often caused by:

1. Java version mismatch - Burp 2025.x uses bundled Java, check compatibility
2. Swing/AWT changes in newer Burp releases

Potential fixes:

• Try running Burp with older Java: java -jar burpsuite.jar
• Check if there's an updated AuthMatrix version
• Try Burp's legacy UI mode if available

Workarounds:

• Use AuthMatrix via the API instead of GUI
• Downgrade Burp temporarily for critical testing
• Check PortSwigger forums for known issues with this version

Could you share:

1. Exact error message or behavior?
2. AuthMatrix version?
3. OS you're running on?

This will help narrow down the fix!

[bad-antics]

GUI issues in newer Burp versions are often caused by Java/Swing changes.

Potential fixes:

1. Check for updated AuthMatrix version
2. Try running with external Java: java -jar burpsuite.jar
3. Check Burp's compatibility settings

Workarounds:

• Use AuthMatrix via API instead of GUI
• Downgrade Burp temporarily for critical testing

Could you share the exact error and AuthMatrix version? That will help narrow down the fix.

[Abyssraven0x13]

@bad-antics As I mentioned above, the bug fix was merged into the community-maintained repository (commit earth11411/AuthMatrix@a897cb5)