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Zyxel WAX650S CVE-2026-8508

| EUVDEUVD-2026-52567 MEDIUM
Improper Authentication (CWE-287)
2026-08-04 Zyxel GHSA-hq2r-whw2-gr82
Zyxel Authentication Bypass Wax650S Firmware
6.5
CVSS 3.1 · Vendor: Zyxel
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Severity by source

Vendor (Zyxel) PRIMARY
6.5 MEDIUM
AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
6.5 MEDIUM

Adjacent network vector confirmed; PR:N as captive portal bypass requires no prior credentials; C:H reflects full post-portal network access; no integrity or availability impact from bypass alone.

3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (Zyxel).

CVSS VectorVendor: Zyxel

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

1
Analysis Generated
Aug 04, 2026 - 02:43 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Captive portal authentication bypass in Zyxel WAX650S firmware exposes guest or restricted wireless networks to unauthorized access by any WLAN-adjacent attacker. The flaw resides in the social_login.cgi CGI handler, where CWE-287 (Improper Authentication) allows requests to circumvent captive portal enforcement entirely - not just weaken it. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Associate with target WLAN
Delivery
Identify social_login.cgi captive portal endpoint
Exploit
Send crafted unauthenticated request to CGI handler
Execution
Authentication check bypassed
Impact
Access network resources behind captive portal
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Vulnerability AssessmentAI

Exploitation The captive portal feature with social login must be enabled and actively in use on the WAX650S - this is a non-default configuration that requires administrative setup. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 6.5 (Medium) score reflects real-world severity accurately: AV:A limits the blast radius to the local WLAN segment, ruling out remote internet-facing exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker associates with the WAX650S-hosted WLAN - for example, a guest network in a hotel or enterprise lobby - and, without entering valid credentials, crafts an HTTP request directly to the social_login.cgi endpoint that satisfies or skips its authentication validation. The captive portal marks the attacker's session as authenticated, granting full network access behind the portal. …
Remediation Consult the Zyxel security advisory at https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-improper-authentication-vulnerabilities-in-certain-aps-fwa7-and-security-routers-08-04-2026 and apply the firmware update that supersedes 7.10(ABRM.4)C0; a specific patched version number was not independently confirmed from the available input data - verify the exact target version from the advisory before deploying. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-8508 vulnerability details – vuln.today
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