Bug ID 1035361: Illegal cross-origin after successful CAPTCHA

Last Modified: Feb 07, 2024

Affected Product(s):
BIG-IP ASM(all modules)

Fixed In:
17.1.0,,, 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

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips