CVE-2026-86478

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

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

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

In JetBrains YouTrack before 2025.3.161254, 2026.1.14042 improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a self-asserted email address

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 9, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Fixed security issues

https://www.jetbrains.com/privacy-security/issues-fixed/

Vendor Advisories for CVE-2026-86478(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 53× in last 7d / 100× 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. 2026-09-19 23:41 UTCGHSA enrichment
  2. 2026-09-19 19:25 UTCEG score recompute
  3. 2026-09-19 19:25 UTCGHSA enrichment
  4. 2026-09-19 15:09 UTCGHSA enrichment
  5. 2026-09-19 10:47 UTCGHSA enrichment
  6. 2026-09-19 06:31 UTCGHSA enrichment
  7. 2026-09-19 02:15 UTCGHSA enrichment
  8. 2026-09-18 21:56 UTCEG score recompute
  9. 2026-09-18 21:56 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 17:40 UTCGHSA enrichment
  12. 2026-09-18 13:24 UTCGHSA enrichment
  13. 2026-09-18 09:08 UTCGHSA enrichment
  14. 2026-09-18 04:52 UTCGHSA enrichment
  15. 2026-09-18 00:36 UTCGHSA enrichment
  16. 2026-09-17 20:20 UTCEG score recompute
  17. 2026-09-17 20:20 UTCGHSA enrichment
  18. 2026-09-17 19:32 UTCEPSS rescore
  19. 2026-09-17 15:48 UTCGHSA enrichment
  20. 2026-09-17 11:32 UTCGHSA enrichment
  21. 2026-09-17 07:16 UTCGHSA enrichment
  22. 2026-09-17 02:58 UTCGHSA enrichment
  23. 2026-09-16 22:36 UTCGHSA enrichment
  24. 2026-09-16 18:19 UTCEG score recompute
  25. 2026-09-16 18:19 UTCGHSA enrichment
Show 75 more
  1. 2026-09-16 14:09 UTCEPSS rescore
  2. 2026-09-16 14:01 UTCGHSA enrichment
  3. 2026-09-16 09:44 UTCGHSA enrichment
  4. 2026-09-16 05:27 UTCEG score recompute
  5. 2026-09-16 05:27 UTCGHSA enrichment
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-16 01:11 UTCGHSA enrichment
  8. 2026-09-15 20:55 UTCGHSA enrichment
  9. 2026-09-15 16:38 UTCGHSA enrichment
  10. 2026-09-15 12:21 UTCGHSA enrichment
  11. 2026-09-15 08:03 UTCGHSA enrichment
  12. 2026-09-15 03:47 UTCEG score recompute
  13. 2026-09-15 03:47 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 23:31 UTCGHSA enrichment
  17. 2026-09-14 18:39 UTCGHSA enrichment
  18. 2026-09-14 14:23 UTCGHSA enrichment
  19. 2026-09-14 10:07 UTCGHSA enrichment
  20. 2026-09-14 05:51 UTCGHSA enrichment
  21. 2026-09-14 01:35 UTCGHSA enrichment
  22. 2026-09-13 21:19 UTCGHSA enrichment
  23. 2026-09-13 17:03 UTCEG score recompute
  24. 2026-09-13 17:03 UTCGHSA enrichment
  25. 2026-09-13 12:47 UTCGHSA enrichment
  26. 2026-09-13 08:31 UTCGHSA enrichment
  27. 2026-09-13 04:14 UTCGHSA enrichment
  28. 2026-09-12 23:59 UTCGHSA enrichment
  29. 2026-09-12 19:43 UTCGHSA enrichment
  30. 2026-09-12 15:27 UTCEG score recompute
  31. 2026-09-12 15:27 UTCGHSA enrichment
  32. 2026-09-12 11:10 UTCGHSA enrichment
  33. 2026-09-12 06:54 UTCGHSA enrichment
  34. 2026-09-12 02:37 UTCGHSA enrichment
  35. 2026-09-11 22:20 UTCGHSA enrichment
  36. 2026-09-11 18:04 UTCEG score recompute
  37. 2026-09-11 18:04 UTCGHSA enrichment
  38. 2026-09-11 14:53 UTCEPSS rescore
  39. 2026-09-11 14:53 UTCEPSS rescore
  40. 2026-09-11 13:47 UTCEG score recompute
  41. 2026-09-11 13:47 UTCGHSA enrichment
  42. 2026-09-11 09:31 UTCGHSA enrichment
  43. 2026-09-11 05:15 UTCGHSA enrichment
  44. 2026-09-11 00:59 UTCGHSA enrichment
  45. 2026-09-10 20:43 UTCGHSA enrichment
  46. 2026-09-10 16:27 UTCGHSA enrichment
  47. 2026-09-10 12:06 UTCEG score recompute
  48. 2026-09-10 12:06 UTCGHSA enrichment
  49. 2026-09-10 07:50 UTCGHSA enrichment
  50. 2026-09-10 03:34 UTCGHSA enrichment
  51. 2026-09-09 23:17 UTCGHSA enrichment
  52. 2026-09-09 18:22 UTCGHSA enrichment
  53. 2026-09-09 14:05 UTCGHSA enrichment
  54. 2026-09-09 09:48 UTCGHSA enrichment
  55. 2026-09-09 05:32 UTCEG score recompute
  56. 2026-09-09 05:32 UTCGHSA enrichment
  57. 2026-09-09 04:42 UTCEG score recompute
  58. 2026-09-09 04:41 UTCGHSA enrichment
  59. 2026-09-09 03:20 UTCGHSA enrichment
  60. 2026-09-08 23:04 UTCEG score recompute
  61. 2026-09-08 23:03 UTCGHSA enrichment
  62. 2026-09-08 22:01 UTCEPSS rescore
  63. 2026-09-08 15:56 UTCGHSA enrichment
  64. 2026-09-08 11:42 UTCEG score recompute
  65. 2026-09-08 11:41 UTCGHSA enrichment
  66. 2026-09-08 10:58 UTCEG score recompute
  67. 2026-09-08 10:58 UTCGHSA enrichment
  68. 2026-09-08 10:30 UTCGHSA enrichment
  69. 2026-09-08 06:13 UTCGHSA enrichment
  70. 2026-09-08 01:55 UTCGHSA enrichment
  71. 2026-09-07 21:39 UTCEG score recompute
  72. 2026-09-07 21:39 UTCGHSA enrichment
  73. 2026-09-07 17:23 UTCEG score recompute
  74. 2026-09-07 16:35 UTCEG score recompute
  75. 2026-09-07 16:35 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-86478?
CVE-2026-86478 is a critical vulnerability published on September 7, 2026. In JetBrains YouTrack before 2025.3.161254, 2026.1.14042 improper authentication in YouTrack Helpdesk allowed unauthenticated account takeover via a self-asserted email address
When was CVE-2026-86478 disclosed?
CVE-2026-86478 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-2026-86478 actively exploited?
CVE-2026-86478 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 70.4% of all scored CVEs.
What is the CVSS score of CVE-2026-86478?
CVE-2026-86478 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-86478?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86478, 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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