CVE-2026-40857

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (8th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.4EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.4Exploit: None knownExposed services: Not assessed

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

WNC T-Mobile 5G Box IDU router contains a cross-site request forgery (CSRF) vulnerability in the portal.cgi component. The anti-CSRF mechanism fails to validate the csrf_token_value parameter, accepting any arbitrary value as valid. This allows a remote attacker to perform unauthorized actions on the device by tricking an authenticated user into visiting a malicious website.This issue has been fixed in firmware version 1.1.0.651412

CVSS v3
8.4
EG Score
8.4HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA SSVC

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
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 16, 2026

Last Modified

September 28, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Podatności w routerach WNC T-Mobile 5G Box IDU | CERT Polska

https://cert.pl/posts/2026/09/CVE-2026-40854

Vendor Advisories for CVE-2026-40857(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 27× in last 7d / 72× 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. 2026-10-04 09:36 UTCGHSA enrichment
  2. 2026-10-03 22:18 UTCEG score recompute
  3. 2026-10-03 22:17 UTCGHSA enrichment
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-03 10:58 UTCGHSA enrichment
  6. 2026-10-02 23:40 UTCEG score recompute
  7. 2026-10-02 23:40 UTCGHSA enrichment
  8. 2026-10-02 12:22 UTCGHSA enrichment
  9. 2026-10-02 00:11 UTCEG score recompute
  10. 2026-10-02 00:11 UTCGHSA enrichment
  11. 2026-10-01 19:50 UTCEPSS rescore
  12. 2026-10-01 11:58 UTCGHSA enrichment
  13. 2026-10-01 00:38 UTCEG score recompute
  14. 2026-10-01 00:38 UTCGHSA enrichment
  15. 2026-09-30 15:03 UTCEPSS rescore
  16. 2026-09-30 12:12 UTCGHSA enrichment
  17. 2026-09-30 00:53 UTCEG score recompute
  18. 2026-09-30 00:53 UTCGHSA enrichment
  19. 2026-09-29 10:45 UTCGHSA enrichment
  20. 2026-09-28 23:15 UTCEG score recompute
  21. 2026-09-28 23:15 UTCGHSA enrichment
  22. 2026-09-28 14:16 UTCEG score recompute
  23. 2026-09-28 14:16 UTCGHSA enrichment
  24. 2026-09-28 02:58 UTCGHSA enrichment
  25. 2026-09-27 15:39 UTCEG score recompute
Show 47 more
  1. 2026-09-27 15:39 UTCGHSA enrichment
  2. 2026-09-27 13:48 UTCEPSS rescore
  3. 2026-09-27 04:21 UTCGHSA enrichment
  4. 2026-09-26 17:03 UTCEG score recompute
  5. 2026-09-26 17:03 UTCGHSA enrichment
  6. 2026-09-26 15:58 UTCEPSS rescore
  7. 2026-09-26 05:45 UTCEG score recompute
  8. 2026-09-26 05:45 UTCGHSA enrichment
  9. 2026-09-25 18:24 UTCGHSA enrichment
  10. 2026-09-25 07:04 UTCGHSA enrichment
  11. 2026-09-24 19:46 UTCEG score recompute
  12. 2026-09-24 19:46 UTCGHSA enrichment
  13. 2026-09-24 08:28 UTCGHSA enrichment
  14. 2026-09-23 21:11 UTCEG score recompute
  15. 2026-09-23 21:11 UTCGHSA enrichment
  16. 2026-09-23 17:53 UTCEPSS rescore
  17. 2026-09-23 09:53 UTCGHSA enrichment
  18. 2026-09-22 22:35 UTCEG score recompute
  19. 2026-09-22 22:35 UTCGHSA enrichment
  20. 2026-09-22 11:17 UTCGHSA enrichment
  21. 2026-09-21 23:59 UTCEG score recompute
  22. 2026-09-21 23:59 UTCGHSA enrichment
  23. 2026-09-21 12:41 UTCGHSA enrichment
  24. 2026-09-21 01:24 UTCEG score recompute
  25. 2026-09-21 01:24 UTCGHSA enrichment
  26. 2026-09-20 20:15 UTCEPSS rescore
  27. 2026-09-20 14:06 UTCGHSA enrichment
  28. 2026-09-20 02:48 UTCEG score recompute
  29. 2026-09-20 02:48 UTCGHSA enrichment
  30. 2026-09-19 15:30 UTCGHSA enrichment
  31. 2026-09-19 04:12 UTCEG score recompute
  32. 2026-09-19 04:12 UTCGHSA enrichment
  33. 2026-09-18 19:28 UTCEPSS rescore
  34. 2026-09-18 16:55 UTCGHSA enrichment
  35. 2026-09-18 05:37 UTCEG score recompute
  36. 2026-09-18 05:37 UTCGHSA enrichment
  37. 2026-09-17 19:31 UTCEPSS rescore
  38. 2026-09-17 18:19 UTCGHSA enrichment
  39. 2026-09-17 06:42 UTCGHSA enrichment
  40. 2026-09-16 19:25 UTCGHSA enrichment
  41. 2026-09-16 17:42 UTCEG score recompute
  42. 2026-09-16 17:42 UTCGHSA enrichment
  43. 2026-09-16 16:35 UTCEG score recompute
  44. 2026-09-16 16:34 UTCGHSA enrichment
  45. 2026-09-16 12:22 UTCEG score recompute
  46. 2026-09-16 11:32 UTCEG score recompute
  47. 2026-09-16 11:30 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-40857?
CVE-2026-40857 is a high vulnerability published on September 16, 2026. WNC T-Mobile 5G Box IDU router contains a cross-site request forgery (CSRF) vulnerability in the portal.cgi component. The anti-CSRF mechanism fails to validate the csrftokenvalue parameter, accepting any arbitrary value as valid. This allows a remote attacker to perform unauthorized actions on the…
When was CVE-2026-40857 disclosed?
CVE-2026-40857 was first published on September 16, 2026, with the most recent update on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40857 actively exploited?
CVE-2026-40857 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-40857?
CVE-2026-40857 has a CVSS base score of 8.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-40857?
No fix for CVE-2026-40857 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-40857 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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