Description of the issue:
Brave seems to exhibit issues with MantisBT bug tracker web sites, though since I only have an account on one, it is hard to know for sure if this is widespread.
When performing certain tasks like setting up a new tracker, or editing an existing tracker, one gets:
APPLICATION ERROR #2800
Invalid form security token. This could be caused by a session timeout, or accidentally submitting the form twice.
Please use the “Back” button in your web browser to return to the previous page. There you can correct whatever problems were identified in this error or select another action. You can also click an option from the menu bar to go directly to a new section.
Using the Back button does not remediate the issue. Whether a double-submission occurred or not, such is not at the request of the human operating the browser, and as far as a “timeout” goes, the problem occurs when the user is prompt at filling out the forms.
Exact URL of the website in question:
The exact URL where this was observed is not public, but the MantisBT project uses its own software for its Bug Tracker here:
To trigger an error, one would have to have a legitimate account and be able to create a new bug or edit an existing one.
On the site where this was observed, MantisBT details were:
|Database Version, Description|5.5.68, 5.5.68-MariaDB|
Neither Firefox nor Chrome exhibit this behavior.
Did the issue present with default Shields settings? (yes/no)
Does the site function as expected when Shields are turned off?
Is there a specific Shields configuration that causes the site to break? If so, tell us that configuration. (yes/no):
Does the site work as expected when using Chrome?
Yes Version 88.0.4324.190 (Official Build) (64-bit)
Yes Version 89.0.4389.82 (Official Build) (64-bit)
Brave version (check