CVE-2026-18686

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-04. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

A vulnerability was detected in GL.iNet GL-MT3000 up to 4.4.5. The affected element is the function nas-web.add_user of the file /cgi-bin/glc of the component nas-web RPC Wrapper. Performing a manipulation results in command injection. The attack can be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure and confirmed the existence of the vulnerability.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
3%
EPSS %ILE
84%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 12, 2026

Advisory Details (1)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

IOT_Vul_Public/Glinet/MT3000/nas-web/ADD_USER_ADD_SHARE at main · coconut652-7/IOT_Vul_Public · GitHub

https://github.com/coconut652-7/IOT_Vul_Public/tree/main/Glinet/MT3000/nas-web/ADD_USER_ADD_SHARE

Vendor Advisories for CVE-2026-18686(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 58× in last 7d / 143× 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.

Showing the most recent 100 of 143 total refreshes for this CVE.

  1. 2026-08-20 23:03 UTCEG score recompute
  2. 2026-08-20 23:03 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 19:08 UTCGHSA enrichment
  5. 2026-08-20 15:12 UTCGHSA enrichment
  6. 2026-08-20 11:16 UTCGHSA enrichment
  7. 2026-08-20 07:20 UTCGHSA enrichment
  8. 2026-08-20 03:24 UTCGHSA enrichment
  9. 2026-08-19 23:27 UTCGHSA enrichment
  10. 2026-08-19 19:31 UTCEG score recompute
  11. 2026-08-19 19:31 UTCGHSA enrichment
  12. 2026-08-19 17:03 UTCEPSS rescore
  13. 2026-08-19 15:34 UTCGHSA enrichment
  14. 2026-08-19 11:33 UTCGHSA enrichment
  15. 2026-08-19 07:33 UTCGHSA enrichment
  16. 2026-08-19 03:37 UTCGHSA enrichment
  17. 2026-08-18 23:42 UTCGHSA enrichment
  18. 2026-08-18 19:45 UTCGHSA enrichment
  19. 2026-08-18 15:48 UTCEG score recompute
  20. 2026-08-18 15:48 UTCGHSA enrichment
  21. 2026-08-18 13:48 UTCEPSS rescore
  22. 2026-08-18 11:24 UTCGHSA enrichment
  23. 2026-08-18 07:28 UTCGHSA enrichment
  24. 2026-08-18 03:32 UTCGHSA enrichment
  25. 2026-08-17 23:32 UTCGHSA enrichment
Show 75 more
  1. 2026-08-17 19:35 UTCGHSA enrichment
  2. 2026-08-17 15:10 UTCEG score recompute
  3. 2026-08-17 15:10 UTCGHSA enrichment
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-17 11:14 UTCGHSA enrichment
  6. 2026-08-17 07:18 UTCGHSA enrichment
  7. 2026-08-17 03:22 UTCGHSA enrichment
  8. 2026-08-16 23:27 UTCGHSA enrichment
  9. 2026-08-16 19:31 UTCGHSA enrichment
  10. 2026-08-16 15:35 UTCEG score recompute
  11. 2026-08-16 15:35 UTCGHSA enrichment
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 11:39 UTCGHSA enrichment
  14. 2026-08-16 07:43 UTCGHSA enrichment
  15. 2026-08-16 03:47 UTCEG score recompute
  16. 2026-08-16 03:47 UTCGHSA enrichment
  17. 2026-08-16 02:14 UTCEPSS rescore
  18. 2026-08-15 23:51 UTCGHSA enrichment
  19. 2026-08-15 19:55 UTCGHSA enrichment
  20. 2026-08-15 15:59 UTCGHSA enrichment
  21. 2026-08-15 12:03 UTCGHSA enrichment
  22. 2026-08-15 08:07 UTCGHSA enrichment
  23. 2026-08-15 04:11 UTCEG score recompute
  24. 2026-08-15 04:11 UTCGHSA enrichment
  25. 2026-08-15 01:30 UTCEPSS rescore
  26. 2026-08-15 00:14 UTCGHSA enrichment
  27. 2026-08-14 20:19 UTCGHSA enrichment
  28. 2026-08-14 16:23 UTCGHSA enrichment
  29. 2026-08-14 12:27 UTCGHSA enrichment
  30. 2026-08-14 08:31 UTCGHSA enrichment
  31. 2026-08-14 04:35 UTCGHSA enrichment
  32. 2026-08-14 00:39 UTCEG score recompute
  33. 2026-08-14 00:39 UTCGHSA enrichment
  34. 2026-08-13 22:00 UTCEPSS rescore
  35. 2026-08-13 20:43 UTCGHSA enrichment
  36. 2026-08-13 16:47 UTCGHSA enrichment
  37. 2026-08-13 12:51 UTCGHSA enrichment
  38. 2026-08-13 08:55 UTCGHSA enrichment
  39. 2026-08-13 04:59 UTCGHSA enrichment
  40. 2026-08-13 01:04 UTCGHSA enrichment
  41. 2026-08-12 21:08 UTCGHSA enrichment
  42. 2026-08-12 19:24 UTCGHSA enrichment
  43. 2026-08-12 15:28 UTCEG score recompute
  44. 2026-08-12 15:28 UTCGHSA enrichment
  45. 2026-08-12 13:50 UTCEPSS rescore
  46. 2026-08-12 11:22 UTCGHSA enrichment
  47. 2026-08-12 07:25 UTCGHSA enrichment
  48. 2026-08-12 03:29 UTCGHSA enrichment
  49. 2026-08-11 23:33 UTCGHSA enrichment
  50. 2026-08-11 19:37 UTCGHSA enrichment
  51. 2026-08-11 15:39 UTCEG score recompute
  52. 2026-08-11 15:39 UTCGHSA enrichment
  53. 2026-08-11 13:42 UTCEPSS rescore
  54. 2026-08-11 11:43 UTCGHSA enrichment
  55. 2026-08-11 07:48 UTCGHSA enrichment
  56. 2026-08-11 03:51 UTCEG score recompute
  57. 2026-08-11 03:51 UTCGHSA enrichment
  58. 2026-08-11 00:00 UTCEPSS rescore
  59. 2026-08-10 23:56 UTCGHSA enrichment
  60. 2026-08-10 20:00 UTCGHSA enrichment
  61. 2026-08-10 16:04 UTCGHSA enrichment
  62. 2026-08-10 12:08 UTCGHSA enrichment
  63. 2026-08-10 08:12 UTCGHSA enrichment
  64. 2026-08-10 04:16 UTCGHSA enrichment
  65. 2026-08-10 00:20 UTCGHSA enrichment
  66. 2026-08-09 20:24 UTCGHSA enrichment
  67. 2026-08-09 16:28 UTCGHSA enrichment
  68. 2026-08-09 12:33 UTCGHSA enrichment
  69. 2026-08-09 08:37 UTCGHSA enrichment
  70. 2026-08-09 04:41 UTCGHSA enrichment
  71. 2026-08-09 00:45 UTCGHSA enrichment
  72. 2026-08-08 20:49 UTCGHSA enrichment
  73. 2026-08-08 16:53 UTCEG score recompute
  74. 2026-08-08 16:53 UTCGHSA enrichment
  75. 2026-08-08 16:37 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18686?
CVE-2026-18686 is a critical vulnerability published on August 4, 2026. A vulnerability was detected in GL.iNet GL-MT3000 up to 4.4.5. The affected element is the function nas-web.add_user of the file /cgi-bin/glc of the component nas-web RPC Wrapper. Performing a manipulation results in command injection. The attack can be initiated remotely. The exploit is now public…
When was CVE-2026-18686 disclosed?
CVE-2026-18686 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18686 actively exploited?
CVE-2026-18686 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 15.8% of all scored CVEs.
What is the CVSS score of CVE-2026-18686?
CVE-2026-18686 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-18686?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18686, 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.

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