CVE-2026-16347

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM 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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.8Exploit: None knownExposed services: Not assessed

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

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
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity88% × 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
0.4%
EPSS %ILE
30th
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

July 28, 2026

Last Modified

July 30, 2026

Advisory Details (1)

Auto-updated Jul 28, 2026
⚠️ Active exploitation confirmed. No fix on record yet. Sources: cisa.
cisa🔴 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 12× in last 7d / 68× 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 223 total refreshes for this CVE.

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

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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 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 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16347?
CVE-2026-16347 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-16347?
No fix for CVE-2026-16347 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-2026-16347 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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