verify_cf() is not working

[rogsilva]

Hi everyone,
I need some help understanding why the verify_cf() function is unable to solve the Cloudflare captcha shown below.
From what I could gather in the library’s source code, this function attempts to locate the checkbox inside an iframe, so it should theoretically work. However, it consistently times out because the element cannot be found.

If anyone can clarify the reason or point me in the right direction, I’d really appreciate it.

[bomzj]

I confirm cf_verify() not working. Try to test it on "https://nowsecure.nl".

[Bijan-A]

Cloudflare had been working for me up until a few days ago now it has stopped working. I am using headless and headed windows. I even added manually interaction in the headed and it was still able to be detected as a bot.

[gexiea]

Same issue here. Spent a while debugging and realized the problem isn't really the verify_cf() logic itself — Cloudflare is detecting the browser environment before it even gets to the checkbox. The CDP leak and a few canvas/audio signals are enough for it to silently fail the challenge. I ended up switching to a Chromium build that has fewer of those signals baked in (stealthbrowser.org). The checkbox actually appears now. Worth noting: you can also pass custom fingerprint values via JS injection against their build, which kind of sidesteps their paid profile system — though it's obviously not as clean as their native implementation.