Bug ID 1035361: Illegal cross-origin after successful CAPTCHA

Last Modified: Jan 19, 2023

Bug Tracker

Affected Product:  See more info
BIG-IP ASM(all modules)

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5, 16.1.0, 16.1.1, 16.1.2,

Fixed In:,, 14.1.5

Opened: Jul 22, 2021
Severity: 4-Minor


After enabling CAPTCHA locally on BIG-IP with brute force, after configured login attempts, CAPTCHA appears, but after bypassing the CAPTCHA successfully the user receives a support ID with cross-origin violation.


- blocking page appears. - on the event log cross-origin violation is triggered.


- brute force with CAPTCHA mitigation enforced on login page. - cross-origin violation is enforced on the login page. - user fails to login until CAPTCHA appears - user inserts the CAPTCHA correctly


- disable cross-origin violation enforcement.

Fix Information

Fixing origin header offset in reconstruct challenge request.

Behavior Change