Same issue in latest stable brave-browser-1.21.73-linux-amd64 & brave-browser-nightly-1.23.22-linux-amd64:
Filled upstream issue https://github.com/brave/brave-browser/issues/14534, hopefully this was already fixed in https://github.com/brave/brave-core/pull/8158
Fixed in Brave v1.21.74
I am also experiencing a relevant issue. I can't use the IPFS webui using the IPFS node of brave. The error that I get is about CORS

@OdysLam what version of Brave are you running?
Hey @lidel , the latest: Version 1.22.70 Chromium: 89.0.4389.105 (Official Build) (x86_64)
Same problem here. Brave 1.24.86
IPFS Companion in Chrome can connect to the node that Brave is running, but the Brave plugin cannot.
Most helpful comment
Filled upstream issue https://github.com/brave/brave-browser/issues/14534, hopefully this was already fixed in https://github.com/brave/brave-core/pull/8158