CVE-2026-8508

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-08-04. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 4, 2026

Advisory Details (1)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

Zyxel security advisory for command injection and improper authentication vulnerabilities in certain APs, FWA7, and Security Routers | Zyxel Networks

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

Vendor Advisories for CVE-2026-8508(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 22× in last 7d / 60× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 21:05 UTCGHSA enrichment
  3. 2026-08-19 22:25 UTCEG score recompute
  4. 2026-08-19 22:25 UTCGHSA enrichment
  5. 2026-08-19 17:04 UTCEPSS rescore
  6. 2026-08-18 23:40 UTCEG score recompute
  7. 2026-08-18 23:40 UTCGHSA enrichment
  8. 2026-08-18 13:49 UTCEPSS rescore
  9. 2026-08-18 13:49 UTCEPSS rescore
  10. 2026-08-18 00:59 UTCEG score recompute
  11. 2026-08-18 00:59 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 02:13 UTCEG score recompute
  14. 2026-08-17 02:13 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 03:33 UTCEG score recompute
  18. 2026-08-16 03:33 UTCGHSA enrichment
  19. 2026-08-16 02:15 UTCEPSS rescore
  20. 2026-08-15 04:53 UTCEG score recompute
  21. 2026-08-15 04:53 UTCGHSA enrichment
  22. 2026-08-15 01:31 UTCEPSS rescore
  23. 2026-08-14 06:12 UTCEG score recompute
  24. 2026-08-14 06:12 UTCGHSA enrichment
  25. 2026-08-13 22:00 UTCEPSS rescore
Show 35 more
  1. 2026-08-13 07:31 UTCEG score recompute
  2. 2026-08-13 07:31 UTCGHSA enrichment
  3. 2026-08-12 13:51 UTCEPSS rescore
  4. 2026-08-12 08:50 UTCEG score recompute
  5. 2026-08-12 08:50 UTCGHSA enrichment
  6. 2026-08-11 13:43 UTCEPSS rescore
  7. 2026-08-11 10:09 UTCEG score recompute
  8. 2026-08-11 10:09 UTCGHSA enrichment
  9. 2026-08-11 00:00 UTCEPSS rescore
  10. 2026-08-10 11:28 UTCEG score recompute
  11. 2026-08-10 11:28 UTCGHSA enrichment
  12. 2026-08-09 13:47 UTCEPSS rescore
  13. 2026-08-09 12:48 UTCEG score recompute
  14. 2026-08-09 12:48 UTCGHSA enrichment
  15. 2026-08-08 16:37 UTCEPSS rescore
  16. 2026-08-08 14:08 UTCEG score recompute
  17. 2026-08-08 14:08 UTCGHSA enrichment
  18. 2026-08-07 16:30 UTCEPSS rescore
  19. 2026-08-07 15:28 UTCGHSA enrichment
  20. 2026-08-06 16:47 UTCEG score recompute
  21. 2026-08-06 16:47 UTCGHSA enrichment
  22. 2026-08-06 13:47 UTCEPSS rescore
  23. 2026-08-05 19:17 UTCEPSS rescore
  24. 2026-08-05 19:17 UTCEPSS rescore
  25. 2026-08-05 18:06 UTCGHSA enrichment
  26. 2026-08-04 19:26 UTCEG score recompute
  27. 2026-08-04 19:26 UTCGHSA enrichment
  28. 2026-08-04 18:56 UTCEG score recompute
  29. 2026-08-04 18:56 UTCGHSA enrichment
  30. 2026-08-04 15:10 UTCEPSS rescore
  31. 2026-08-04 14:53 UTCEG score recompute
  32. 2026-08-04 14:53 UTCGHSA enrichment
  33. 2026-08-04 03:26 UTCEG score recompute
  34. 2026-08-04 02:23 UTCEG score recompute
  35. 2026-08-04 02:23 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8508?
CVE-2026-8508 is a medium vulnerability published on August 4, 2026. 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.
When was CVE-2026-8508 disclosed?
CVE-2026-8508 was first published in the National Vulnerability Database on August 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8508 actively exploited?
CVE-2026-8508 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.6% of all scored CVEs.
What is the CVSS score of CVE-2026-8508?
CVE-2026-8508 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-8508?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8508, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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