Two of this week’s biggest security stories share a phrase you’ll keep seeing: “authentication bypass.” It’s exactly what it sounds like — a flaw that lets someone get into a system, or act as a trusted user, without supplying valid login credentials. The critical Splunk flaw being exploited right now is a “missing authentication” bug: a service that should ask “who are you?” simply doesn’t. SAP, meanwhile, patched a SAML authentication-bypass flaw that let attackers forge a trusted identity. Different products, same idea: the lock on the door wasn’t actually checking the key.

Think of authentication as the bouncer at the front door. Normally, no valid ID means no entry. An authentication bypass is a side door the bouncer doesn’t watch — or a fake ID that gets waved straight through. That matters because authentication is the control most of your other protections quietly assume is working. Once it’s bypassed, the attacker isn’t a stranger rattling the handle; as far as your systems are concerned, they’re a legitimate user. They can read data, change settings or plant malware, and your logs may show nothing out of the ordinary.

For a business, the practical takeaway is that bypass flaws are the ones to patch first. They’re often unauthenticated (no password needed) and remotely exploitable — the worst possible combination. Keep an inventory of your internet-facing systems — VPNs, file servers, admin panels, monitoring tools — and make sure someone is watching vendor advisories for them. When a bypass flaw lands for software you actually use, it jumps the queue.

If you’re not sure what’s exposed, or who’s tracking those advisories on your behalf, that’s worth a conversation. Our team can help you map it out.