CVE-2026-86426

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-07. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 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: 4%CVSS: 9.8Exploit: Elevated riskExposed: 0

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

LibreNMS before 26.8.0 contains an authentication bypass vulnerability in the REST API that allows unauthenticated attackers to access protected endpoints by sending numeric values instead of string tokens. Attackers can exploit MySQL type coercion by sending small integers like 0 through 9 to match token hashes, gaining access to API functionality including device credentials and administrative features that enable remote code execution through alert templates.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
60(Track*)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
4%
EPSS %ILE
90%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 18, 2026

Advisory Details (2)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

API auth bypass · Advisory · librenms/librenms · GitHub

https://github.com/librenms/librenms/security/advisories/GHSA-cvq8-gqfq-3mvg
generic

LibreNMS before 26.8.0 Authentication Bypass via API Token Type Confusion | Advisories | VulnCheck

https://www.vulncheck.com/advisories/librenms-before-26.8.0-authentication-bypass-via-api-token-type-confusion

Vendor Advisories for CVE-2026-86426(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 59× in last 7d / 153× 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 153 total refreshes for this CVE.

  1. 2026-09-25 08:51 UTCGHSA enrichment
  2. 2026-09-25 05:14 UTCGHSA enrichment
  3. 2026-09-25 01:37 UTCGHSA enrichment
  4. 2026-09-24 21:59 UTCGHSA enrichment
  5. 2026-09-24 18:22 UTCGHSA enrichment
  6. 2026-09-24 14:22 UTCEG score recompute
  7. 2026-09-24 14:22 UTCGHSA enrichment
  8. 2026-09-24 14:04 UTCEPSS rescore
  9. 2026-09-24 10:15 UTCGHSA enrichment
  10. 2026-09-24 06:38 UTCGHSA enrichment
  11. 2026-09-24 03:01 UTCGHSA enrichment
  12. 2026-09-23 23:24 UTCGHSA enrichment
  13. 2026-09-23 19:43 UTCEG score recompute
  14. 2026-09-23 19:43 UTCGHSA enrichment
  15. 2026-09-23 17:54 UTCEPSS rescore
  16. 2026-09-23 15:38 UTCGHSA enrichment
  17. 2026-09-23 12:00 UTCGHSA enrichment
  18. 2026-09-23 08:23 UTCGHSA enrichment
  19. 2026-09-23 04:46 UTCGHSA enrichment
  20. 2026-09-23 01:09 UTCGHSA enrichment
  21. 2026-09-22 21:32 UTCGHSA enrichment
  22. 2026-09-22 17:55 UTCEG score recompute
  23. 2026-09-22 17:55 UTCGHSA enrichment
  24. 2026-09-22 16:01 UTCEPSS rescore
  25. 2026-09-22 13:45 UTCGHSA enrichment
Show 75 more
  1. 2026-09-22 10:09 UTCGHSA enrichment
  2. 2026-09-22 06:31 UTCGHSA enrichment
  3. 2026-09-22 02:55 UTCGHSA enrichment
  4. 2026-09-21 23:17 UTCEG score recompute
  5. 2026-09-21 23:17 UTCGHSA enrichment
  6. 2026-09-21 21:09 UTCEPSS rescore
  7. 2026-09-21 19:40 UTCGHSA enrichment
  8. 2026-09-21 16:03 UTCGHSA enrichment
  9. 2026-09-21 12:26 UTCGHSA enrichment
  10. 2026-09-21 08:50 UTCGHSA enrichment
  11. 2026-09-21 05:05 UTCGHSA enrichment
  12. 2026-09-21 01:28 UTCGHSA enrichment
  13. 2026-09-20 21:43 UTCGHSA enrichment
  14. 2026-09-20 18:06 UTCGHSA enrichment
  15. 2026-09-20 14:26 UTCGHSA enrichment
  16. 2026-09-20 10:45 UTCGHSA enrichment
  17. 2026-09-20 07:08 UTCGHSA enrichment
  18. 2026-09-20 03:24 UTCGHSA enrichment
  19. 2026-09-19 23:47 UTCGHSA enrichment
  20. 2026-09-19 20:10 UTCGHSA enrichment
  21. 2026-09-19 16:33 UTCEG score recompute
  22. 2026-09-19 16:33 UTCGHSA enrichment
  23. 2026-09-19 12:56 UTCGHSA enrichment
  24. 2026-09-19 09:18 UTCGHSA enrichment
  25. 2026-09-19 05:38 UTCGHSA enrichment
  26. 2026-09-19 02:01 UTCGHSA enrichment
  27. 2026-09-18 22:23 UTCEG score recompute
  28. 2026-09-18 22:23 UTCGHSA enrichment
  29. 2026-09-18 19:28 UTCEPSS rescore
  30. 2026-09-18 18:47 UTCEG score recompute▲ 0.60
  31. 2026-09-18 18:47 UTCGHSA enrichment
  32. 2026-09-18 18:46 UTCNVD updateCVSS v3 → 9.8
  33. 2026-09-18 18:17 UTCGHSA enrichment
  34. 2026-09-18 14:26 UTCGHSA enrichment
  35. 2026-09-18 10:49 UTCGHSA enrichment
  36. 2026-09-18 07:12 UTCGHSA enrichment
  37. 2026-09-18 03:35 UTCGHSA enrichment
  38. 2026-09-17 23:58 UTCGHSA enrichment
  39. 2026-09-17 20:21 UTCEG score recompute
  40. 2026-09-17 20:21 UTCGHSA enrichment
  41. 2026-09-17 19:32 UTCEPSS rescore
  42. 2026-09-17 14:10 UTCGHSA enrichment
  43. 2026-09-17 10:28 UTCGHSA enrichment
  44. 2026-09-17 06:51 UTCGHSA enrichment
  45. 2026-09-17 03:14 UTCGHSA enrichment
  46. 2026-09-16 23:37 UTCGHSA enrichment
  47. 2026-09-16 20:00 UTCGHSA enrichment
  48. 2026-09-16 16:15 UTCEG score recompute
  49. 2026-09-16 16:15 UTCGHSA enrichment
  50. 2026-09-16 14:09 UTCEPSS rescore
  51. 2026-09-16 12:36 UTCGHSA enrichment
  52. 2026-09-16 08:59 UTCEG score recompute
  53. 2026-09-16 08:59 UTCGHSA enrichment
  54. 2026-09-16 05:15 UTCEPSS rescore
  55. 2026-09-16 05:09 UTCGHSA enrichment
  56. 2026-09-16 01:32 UTCGHSA enrichment
  57. 2026-09-15 21:55 UTCGHSA enrichment
  58. 2026-09-15 18:18 UTCGHSA enrichment
  59. 2026-09-15 14:38 UTCGHSA enrichment
  60. 2026-09-15 10:58 UTCGHSA enrichment
  61. 2026-09-15 06:57 UTCGHSA enrichment
  62. 2026-09-15 03:20 UTCEG score recompute
  63. 2026-09-15 03:19 UTCGHSA enrichment
  64. 2026-09-15 03:12 UTCEPSS rescore
  65. 2026-09-15 03:12 UTCEPSS rescore
  66. 2026-09-14 23:42 UTCGHSA enrichment
  67. 2026-09-14 20:04 UTCGHSA enrichment
  68. 2026-09-14 16:27 UTCGHSA enrichment
  69. 2026-09-14 12:48 UTCGHSA enrichment
  70. 2026-09-14 09:11 UTCGHSA enrichment
  71. 2026-09-14 05:34 UTCGHSA enrichment
  72. 2026-09-14 01:56 UTCGHSA enrichment
  73. 2026-09-13 22:19 UTCGHSA enrichment
  74. 2026-09-13 18:42 UTCEG score recompute
  75. 2026-09-13 18:42 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-86426.yaml
    First seen Jan 1, 2026

    LibreNMS <= 26.7.0 - Unauthenticated API Access

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86426?
CVE-2026-86426 is a critical vulnerability published on September 7, 2026. LibreNMS before 26.8.0 contains an authentication bypass vulnerability in the REST API that allows unauthenticated attackers to access protected endpoints by sending numeric values instead of string tokens. Attackers can exploit MySQL type coercion by sending small integers like 0 through 9 to…
When was CVE-2026-86426 disclosed?
CVE-2026-86426 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86426 actively exploited?
CVE-2026-86426 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4% probability of exploitation in the next 30 days, which ranks it in the top 10.2% of all scored CVEs.
What is the CVSS score of CVE-2026-86426?
CVE-2026-86426 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-86426?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86426, 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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