CPanel and WHM Authentication Bypass – CVE-2026-41940

0xbadcafebee

Y'know what would help protect those internet buildings from falling on people? A software building code

debo_

I wonder how much of the web still runs on perl. I miss it sometimes.

superasn

Everytime I read one of these it always boils down to the same thing..Don't solve solved problems. And the best code in this case is code you didn't write as PHP's session handler is battle-tested but every line you write to roll your own is a line you have to secure, maintain, and eventually patch at 2am when someone finds the bug. Session handling, auth, crypto, password hashing etc - all these are the exact areas where you should be the most allergic to rolling your own. Not because you're not smart enough, but because a simple bug like sanitizing in the wrong place and the failure is catastrophic like in this instance. Use boring, proven, widely-audited solutions. Save your creativity for the actual problem you're solving.

yabones

Oooooh that's really bad. Wordpress on Cpanel sites is like the Dark Matter of the internet, it's everywhere and you don't see it until something bad happens. Libations for the sysadmins patching & cleaning up this mess.

Loudergood

That's gonna pair really well with this. https://copy.fail

ChrisArchitect

Earlier: https://news.ycombinator.com/item?id=47967974

ls612

Something that is starting to concern me with the flood of cyber chaos in the past couple of months is my homelab. Currently I do not have it set up to be accessible outside the local network and then add it and all my other devices to my tailnet to facilitate remote access (via an exit node on my local network). On top of that TrueNAS doesn't seem to have the best update cadence so I'm worried about having a system with known vulnerabilities only protected by not being accessible remotely in theory.

whalesalad

> this vulnerability affects - and we cannot stress this enough - all currently supported versions of cPanel & WHM yikes. https://www.shodan.io/search?query=basic+realm%3D%22cPanel%2...

amluto

I like how the vulnerability is in the path that (a) attempts to write the password in reversibly encrypted form to disk [0] and (b) has a weird fallback path that writes it in clear text. Sigh. [0] cPabel seems to be from 1996. We’ve known this is a mistake since before 1996.