CVE-2026-16347

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-28. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

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

MikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards against excessive login attempts. The system does not enforce meaningful rate-limiting, account lockout, or source-based restrictions, allowing repeated authentication failures to proceed without defensive response. In some versions, a fixed per-connection delay is present, but it can be bypassed through concurrent sessions, resulting in continued high-volume attempts. This deficiency increases the risk that an attacker could eventually obtain valid credentials and gain unauthorized access to administrative services.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 30, 2026

Advisory Details (1)

Auto-updated Jul 28, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

MikroTik RouterOS and Cloud Hosted Router | CISA

MikroTik RouterOS and Cloud Hosted Router | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/news-events/ics-advisories/icsa-26-209-05

Vendor Advisories for CVE-2026-16347(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 24× in last 7d / 117× 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 117 total refreshes for this CVE.

  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-26 12:42 UTCGHSA enrichment
  3. 2026-08-26 01:12 UTCEG score recompute
  4. 2026-08-26 01:11 UTCGHSA enrichment
  5. 2026-08-25 13:48 UTCEPSS rescore
  6. 2026-08-25 13:43 UTCGHSA enrichment
  7. 2026-08-25 02:14 UTCGHSA enrichment
  8. 2026-08-24 14:46 UTCEG score recompute
  9. 2026-08-24 14:46 UTCGHSA enrichment
  10. 2026-08-24 03:16 UTCGHSA enrichment
  11. 2026-08-23 15:35 UTCGHSA enrichment
  12. 2026-08-23 04:07 UTCGHSA enrichment
  13. 2026-08-22 16:38 UTCGHSA enrichment
  14. 2026-08-22 05:09 UTCEG score recompute
  15. 2026-08-22 05:09 UTCGHSA enrichment
  16. 2026-08-21 23:49 UTCEPSS rescore
  17. 2026-08-21 17:40 UTCGHSA enrichment
  18. 2026-08-21 06:11 UTCEG score recompute
  19. 2026-08-21 06:11 UTCGHSA enrichment
  20. 2026-08-20 22:55 UTCEPSS rescore
  21. 2026-08-20 18:42 UTCGHSA enrichment
  22. 2026-08-20 07:14 UTCGHSA enrichment
  23. 2026-08-19 19:46 UTCEG score recompute
  24. 2026-08-19 19:46 UTCGHSA enrichment
  25. 2026-08-19 17:03 UTCEPSS rescore
Show 75 more
  1. 2026-08-19 06:27 UTCGHSA enrichment
  2. 2026-08-18 18:53 UTCEG score recompute
  3. 2026-08-18 18:53 UTCGHSA enrichment
  4. 2026-08-18 13:48 UTCEPSS rescore
  5. 2026-08-18 07:24 UTCGHSA enrichment
  6. 2026-08-17 19:56 UTCEG score recompute
  7. 2026-08-17 19:56 UTCGHSA enrichment
  8. 2026-08-17 13:47 UTCEPSS rescore
  9. 2026-08-17 07:04 UTCGHSA enrichment
  10. 2026-08-16 19:36 UTCEG score recompute
  11. 2026-08-16 19:36 UTCGHSA enrichment
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 08:07 UTCEG score recompute
  14. 2026-08-16 08:07 UTCGHSA enrichment
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-15 20:39 UTCGHSA enrichment
  17. 2026-08-15 09:11 UTCEG score recompute
  18. 2026-08-15 09:11 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 21:43 UTCGHSA enrichment
  21. 2026-08-14 10:15 UTCGHSA enrichment
  22. 2026-08-13 22:47 UTCEG score recompute
  23. 2026-08-13 22:47 UTCGHSA enrichment
  24. 2026-08-13 22:00 UTCEPSS rescore
  25. 2026-08-13 11:17 UTCGHSA enrichment
  26. 2026-08-12 23:49 UTCEG score recompute
  27. 2026-08-12 23:49 UTCGHSA enrichment
  28. 2026-08-12 13:50 UTCEPSS rescore
  29. 2026-08-12 12:21 UTCGHSA enrichment
  30. 2026-08-12 00:52 UTCEG score recompute
  31. 2026-08-12 00:52 UTCGHSA enrichment
  32. 2026-08-11 13:42 UTCEPSS rescore
  33. 2026-08-11 13:24 UTCGHSA enrichment
  34. 2026-08-11 01:55 UTCEG score recompute
  35. 2026-08-11 01:55 UTCGHSA enrichment
  36. 2026-08-11 00:00 UTCEPSS rescore
  37. 2026-08-10 14:27 UTCGHSA enrichment
  38. 2026-08-10 02:58 UTCGHSA enrichment
  39. 2026-08-09 15:30 UTCEG score recompute
  40. 2026-08-09 15:30 UTCGHSA enrichment
  41. 2026-08-09 13:46 UTCEPSS rescore
  42. 2026-08-09 04:02 UTCEG score recompute
  43. 2026-08-09 04:02 UTCGHSA enrichment
  44. 2026-08-08 16:37 UTCEPSS rescore
  45. 2026-08-08 16:34 UTCGHSA enrichment
  46. 2026-08-08 05:05 UTCGHSA enrichment
  47. 2026-08-07 17:37 UTCEG score recompute
  48. 2026-08-07 17:37 UTCGHSA enrichment
  49. 2026-08-07 06:09 UTCGHSA enrichment
  50. 2026-08-06 18:41 UTCEG score recompute
  51. 2026-08-06 18:41 UTCGHSA enrichment
  52. 2026-08-06 13:46 UTCEPSS rescore
  53. 2026-08-06 07:13 UTCGHSA enrichment
  54. 2026-08-05 19:45 UTCEG score recompute
  55. 2026-08-05 19:45 UTCGHSA enrichment
  56. 2026-08-05 19:17 UTCEPSS rescore
  57. 2026-08-05 08:16 UTCGHSA enrichment
  58. 2026-08-04 20:49 UTCEG score recompute
  59. 2026-08-04 20:48 UTCGHSA enrichment
  60. 2026-08-04 15:10 UTCEPSS rescore
  61. 2026-08-04 10:38 UTCEPSS rescore
  62. 2026-08-04 09:11 UTCGHSA enrichment
  63. 2026-08-03 21:39 UTCEG score recompute
  64. 2026-08-03 21:39 UTCGHSA enrichment
  65. 2026-08-03 10:35 UTCEPSS rescore
  66. 2026-08-03 10:11 UTCGHSA enrichment
  67. 2026-08-02 22:43 UTCGHSA enrichment
  68. 2026-08-02 11:15 UTCEG score recompute
  69. 2026-08-02 11:15 UTCGHSA enrichment
  70. 2026-08-02 02:26 UTCEPSS rescore
  71. 2026-08-01 23:46 UTCGHSA enrichment
  72. 2026-08-01 12:18 UTCEG score recompute
  73. 2026-08-01 12:18 UTCGHSA enrichment
  74. 2026-08-01 04:15 UTCEPSS rescore
  75. 2026-08-01 00:49 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16347?
CVE-2026-16347 is a high vulnerability published on July 28, 2026. MikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards against excessive login attempts. The system does not enforce meaningful rate-limiting, account lockout, or source-based restrictions, allowing repeated authentication failures to proceed…
When was CVE-2026-16347 disclosed?
CVE-2026-16347 was first published in the National Vulnerability Database on July 28, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16347 actively exploited?
CVE-2026-16347 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 81.9% of all scored CVEs.
What is the CVSS score of CVE-2026-16347?
CVE-2026-16347 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-16347?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16347, 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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