Issue solving cloudflare captcha

[sebastian-hermix]

I’m running Python 3.12 with seleniumbase==4.28.5 and Chrome for Testing 143.0.7499.40 inside a Docker container.

The following code executes without raising any errors, but when I compare screenshots taken before and after the call, there is no visible change.

Am I using the correct method and passing the correct arguments? If so, are there any recommendations for how I can debug this further and verify that the method is actually performing the expected action inside the Docker environment?

I’d also appreciate any suggestions for a better way to diagnose what’s happening or confirm whether I’m calling the right SeleniumBase method for this use case.

        with SB(uc=True, headless=True) as sb:
            url = "https://core.particle.network/cloudflare.html"
            sb.uc_open_with_reconnect(url, 5)
            sb.save_screenshot("page_before_click.png")
            sb.uc_gui_click_captcha()
            sb.sleep(5)
            sb.save_screenshot("page_after_click.png")
            html_content = sb.get_page_source()
            print(html_content)

logs

selenium.webdriver.common.driver_finder 2026-09-02 07:15:43,626 DEBUG    Skipping Selenium Manager; path to chrome driver specified in Service class: /usr/local/lib/python3.12/site-packages/seleniumbase/drivers/chromedriver
selenium.webdriver.common.service 2026-09-02 07:15:43,628 DEBUG    Started executable: `/usr/local/lib/python3.12/site-packages/seleniumbase/drivers/chromedriver` in a child process with pid: 6471 using 0 to output -3
selenium.webdriver.common.driver_finder 2026-09-02 07:15:44,579 DEBUG    Skipping Selenium Manager; path to chrome driver specified in Service class: /usr/local/lib/python3.12/site-packages/seleniumbase/drivers/uc_driver
selenium.webdriver.common.service 2026-09-02 07:15:44,581 DEBUG    Started executable: `/usr/local/lib/python3.12/site-packages/seleniumbase/drivers/uc_driver` in a child process with pid: 6568 using 0 to output -1
selenium.webdriver.common.service 2026-09-02 07:15:50,769 DEBUG    Started executable: `/usr/local/lib/python3.12/site-packages/seleniumbase/drivers/uc_driver` in a child process with pid: 6762 using 0 to output -1
uc 2026-09-02 07:15:56,929 DEBUG    Terminating the UC browser
uc 2026-09-02 07:15:57,005 DEBUG    Stopping webdriver service
uc 2026-09-02 07:15:57,037 DEBUG    Successfully removed /tmp/tmpxcu6twnu
uc 2026-09-02 07:15:57,089 DEBUG    Terminating the UC browser
uc 2026-09-02 07:15:57,140 DEBUG    Stopping webdriver service

[mdmintz]

Looks like you're using a really old version of SeleniumBase. Latest is 4.53.5.

Also, you're using UC Mode without CDP Mode. For top stealth, activate CDP Mode from UC Mode by calling sb.activate_cdp_mode(), or it's also automatic if you just call sb.goto(url) from UC Mode.

The new CAPTCHA-clicking method is sb.solve_captcha(). It uses CDP instead of PyAutoGUI.

Here's the updated file:

from seleniumbase import SB

with SB(uc=True, headless=True) as sb:
    sb.activate_cdp_mode()
    sb.goto("https://core.particle.network/cloudflare.html")
    sb.sleep(1)
    sb.solve_captcha()
    sb.sleep(2)
    sb.save_screenshot("page_after_click.png")
    html_content = sb.get_page_source()
    print(html_content)

Here's a Dockerfile that includes a stealthy fingerprint:
https://github.com/seleniumbase/SeleniumBase/blob/master/Dockerfile
(You can't just use any Dockerfile because standard fonts may be missing.)