CVE-2026-66842

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-02. 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.

BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts through an undisclosed request to Traffic Management User Interface (TMUI).

Impact:

This vulnerability may allow an authenticated attacker with network access to the BIG-IP management interface to escalate privileges by creating administrative accounts on the BIG-IP system. There is no data plane exposure; this is a control plane issue only.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

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
21%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 3, 2026

Advisory Details (1)

Auto-updated Sep 2, 2026
No patch confirmed yet.
generic

myF5

https://my.f5.com/manage/s/article/K000162521

Vendor Advisories for CVE-2026-66842(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 / 71× 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. 2026-09-21 05:37 UTCEG score recompute
  2. 2026-09-21 05:37 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 16:49 UTCGHSA enrichment
  5. 2026-09-20 04:02 UTCEG score recompute
  6. 2026-09-20 04:01 UTCGHSA enrichment
  7. 2026-09-19 15:13 UTCGHSA enrichment
  8. 2026-09-19 02:25 UTCEG score recompute
  9. 2026-09-19 02:25 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 13:38 UTCGHSA enrichment
  12. 2026-09-18 00:50 UTCEG score recompute
  13. 2026-09-18 00:50 UTCGHSA enrichment
  14. 2026-09-17 12:02 UTCGHSA enrichment
  15. 2026-09-16 23:14 UTCEG score recompute
  16. 2026-09-16 23:14 UTCGHSA enrichment
  17. 2026-09-16 14:08 UTCEPSS rescore
  18. 2026-09-16 10:26 UTCEG score recompute
  19. 2026-09-16 10:26 UTCGHSA enrichment
  20. 2026-09-16 05:15 UTCEPSS rescore
  21. 2026-09-15 21:38 UTCGHSA enrichment
  22. 2026-09-15 08:46 UTCEG score recompute
  23. 2026-09-15 08:46 UTCGHSA enrichment
  24. 2026-09-14 19:58 UTCGHSA enrichment
  25. 2026-09-14 07:10 UTCGHSA enrichment
Show 46 more
  1. 2026-09-13 18:23 UTCEG score recompute
  2. 2026-09-13 18:23 UTCGHSA enrichment
  3. 2026-09-13 05:35 UTCGHSA enrichment
  4. 2026-09-12 16:48 UTCEG score recompute
  5. 2026-09-12 16:48 UTCGHSA enrichment
  6. 2026-09-12 04:00 UTCGHSA enrichment
  7. 2026-09-11 15:12 UTCEG score recompute
  8. 2026-09-11 15:12 UTCGHSA enrichment
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 09:37 UTCEPSS rescore
  11. 2026-09-11 02:24 UTCGHSA enrichment
  12. 2026-09-10 13:36 UTCEG score recompute
  13. 2026-09-10 13:36 UTCGHSA enrichment
  14. 2026-09-10 00:48 UTCGHSA enrichment
  15. 2026-09-09 12:00 UTCGHSA enrichment
  16. 2026-09-08 23:12 UTCEG score recompute
  17. 2026-09-08 23:12 UTCGHSA enrichment
  18. 2026-09-08 22:01 UTCEPSS rescore
  19. 2026-09-08 08:26 UTCGHSA enrichment
  20. 2026-09-07 19:38 UTCEG score recompute
  21. 2026-09-07 19:38 UTCGHSA enrichment
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-07 06:51 UTCGHSA enrichment
  24. 2026-09-06 18:01 UTCEG score recompute
  25. 2026-09-06 18:01 UTCGHSA enrichment
  26. 2026-09-06 13:47 UTCEPSS rescore
  27. 2026-09-06 05:13 UTCGHSA enrichment
  28. 2026-09-05 16:26 UTCEG score recompute
  29. 2026-09-05 16:26 UTCGHSA enrichment
  30. 2026-09-05 15:31 UTCEPSS rescore
  31. 2026-09-05 03:39 UTCGHSA enrichment
  32. 2026-09-04 14:51 UTCEG score recompute
  33. 2026-09-04 14:51 UTCGHSA enrichment
  34. 2026-09-04 05:07 UTCEPSS rescore
  35. 2026-09-04 02:03 UTCGHSA enrichment
  36. 2026-09-03 13:16 UTCEG score recompute
  37. 2026-09-03 13:16 UTCGHSA enrichment
  38. 2026-09-03 04:56 UTCEG score recompute
  39. 2026-09-03 04:56 UTCGHSA enrichment
  40. 2026-09-02 19:32 UTCGHSA enrichment
  41. 2026-09-02 18:37 UTCEG score recompute
  42. 2026-09-02 18:37 UTCGHSA enrichment
  43. 2026-09-02 18:06 UTCEG score recompute
  44. 2026-09-02 16:37 UTCEG score recompute
  45. 2026-09-02 15:49 UTCEG score recompute
  46. 2026-09-02 15:46 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66842?
CVE-2026-66842 is a high vulnerability published on September 2, 2026. BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts through an undisclosed request to Traffic Management User Interface (TMUI). Impact: This vulnerability may allow an authenticated attacker with network access to the BIG-IP…
When was CVE-2026-66842 disclosed?
CVE-2026-66842 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66842 actively exploited?
CVE-2026-66842 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 79.3% of all scored CVEs.
What is the CVSS score of CVE-2026-66842?
CVE-2026-66842 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-66842?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66842, 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

Explore the affected products and dependency analysis for CVE-2026-66842

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