CVE-2026-8508 Auth bypass in WAX650S firmware
An attacker on the WLAN can bypass captive portal authentication in Zyxel WAX650S firmware due to improper authentication in social_login.cgi.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8508?
CVE-2026-8508 is a medium-severity authentication bypass vulnerability in Zyxel WAX650S firmware, published on 4 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An improper authentication vulnerability in the "social_login.cgi" CGI program in Zyxel WAX650S firmware versions through 7.10(ABRM.4)C0 could allow an attacker on the WLAN to bypass captive portal authentication.
Weakness: CWE-287
Which versions are affected by CVE-2026-8508?
How do I fix CVE-2026-8508?
No fix has been published for CVE-2026-8508 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-2026-8508 being exploited?
There is no known exploitation of CVE-2026-8508 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-hq2r-whw2-gr82.