CVE-2026-76731 Authentication Bypass in the Captive Portal of HPE Networking Instant On
Unauthenticated attackers can bypass captive portal authentication to access and modify limited data in HPE Instant On devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76731?
CVE-2026-76731 is a medium-severity authentication bypass vulnerability in Hewlett Packard Enterprise (HPE) Instant ON, published on 29 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An authentication bypass vulnerability in the captive portal of HPE Networking Instant On could allow an unauthenticated remote attacker to circumvent existing authentication controls. Successful exploitation could allow an attacker to gain limited access to some data and to make limited changes within the affected component.
Weakness: CWE-269
Which versions are affected by CVE-2026-76731?
How do I fix CVE-2026-76731?
No fix has been published for CVE-2026-76731 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-76731 being exploited?
There is no known exploitation of CVE-2026-76731 in the wild and no public exploit code.
Sources
Also known as GHSA-6g54-w9r4-mw9h.