What is CVE-2026-8508?

CVE-2026-8508 is a medium-severity vulnerability in Zyxel Wax650s Firmware, classified under Improper Authentication. CVSS score: 6.5/10. Published 2026-08-04.

How severe is CVE-2026-8508?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2026-8508 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Zyxel Wax650s Firmware

CVE-2026-8508

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.

Vulnerability class: Broken Authentication

EPSS: 0.007 (51.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Zyxel Wax650s Firmware — versions <= 7.10(ABRM.4)C0

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

minanagehsalalma/zyxel-social-login-bypass-cve-2026-8508

References

security@zyxel.com.tw (vendor-advisory)

Frequently asked questions

What is CVE-2026-8508?: CVE-2026-8508 is a medium-severity vulnerability in Zyxel Wax650s Firmware, classified under Improper Authentication. CVSS score: 6.5/10. Published 2026-08-04.
How severe is CVE-2026-8508?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2026-8508 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.