CVE-2026-16876

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% of all CVEs by exploit prediction. 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
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: None knownExposed: 0

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

An authentication bypass vulnerability exists in the WebGUI of Series UNIVERGE IX-R/IX-V. A user could bypass authentication and execute arbitrary CLI commands by tampering with WebGUI messages and sending them to the device via internet.

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
57(Track)
EG Risk 57/100SSVC: 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
Severity93% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 9, 2026

References (1)

Vendor Advisories for CVE-2026-16876(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 49× in last 7d / 107× 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 107 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-16876?
CVE-2026-16876 is a critical vulnerability published on September 7, 2026. An authentication bypass vulnerability exists in the WebGUI of Series UNIVERGE IX-R/IX-V. A user could bypass authentication and execute arbitrary CLI commands by tampering with WebGUI messages and sending them to the device via internet.
When was CVE-2026-16876 disclosed?
CVE-2026-16876 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16876 actively exploited?
CVE-2026-16876 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 73.5% of all scored CVEs.
What is the CVSS score of CVE-2026-16876?
CVE-2026-16876 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-16876?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16876, 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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