CVE-2026-100277

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.3% (18th percentile of EPSS-scored CVEs). GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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

In JetBrains YouTrack before 2026.2.19197 account takeover was possible by replaying a notification signature

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100CISA 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
Severity98% × 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
0.3%
EPSS %ILE
18th
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

September 30, 2026

Last Modified

October 2, 2026

Advisory Details (1)

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

Fixed security issues

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

Vendor Advisories for CVE-2026-100277(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 27× in last 7d / 27× 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. 2026-10-04 07:38 UTCGHSA enrichment
  2. 2026-10-04 03:15 UTCGHSA enrichment
  3. 2026-10-03 22:53 UTCGHSA enrichment
  4. 2026-10-03 18:30 UTCEG score recompute
  5. 2026-10-03 18:29 UTCGHSA enrichment
  6. 2026-10-03 14:25 UTCEPSS rescore
  7. 2026-10-03 14:04 UTCGHSA enrichment
  8. 2026-10-03 09:41 UTCGHSA enrichment
  9. 2026-10-03 05:16 UTCGHSA enrichment
  10. 2026-10-03 00:53 UTCGHSA enrichment
  11. 2026-10-02 20:30 UTCEG score recompute
  12. 2026-10-02 20:30 UTCGHSA enrichment
  13. 2026-10-02 16:05 UTCEG score recompute▲ 0.90
  14. 2026-10-02 16:05 UTCGHSA enrichment
  15. 2026-10-02 16:04 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  16. 2026-10-02 06:40 UTCEG score recompute
  17. 2026-10-02 06:40 UTCGHSA enrichment
  18. 2026-10-01 19:49 UTCEPSS rescore
  19. 2026-10-01 17:30 UTCGHSA enrichment
  20. 2026-10-01 04:21 UTCEG score recompute
  21. 2026-10-01 04:21 UTCGHSA enrichment
  22. 2026-10-01 04:09 UTCEG score recompute
  23. 2026-10-01 04:09 UTCGHSA enrichment
  24. 2026-09-30 16:21 UTCEG score recompute
  25. 2026-09-30 15:52 UTCEG score recompute
Show 2 more
  1. 2026-09-30 15:28 UTCEG score recompute
  2. 2026-09-30 15:27 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-100277?
CVE-2026-100277 is a critical vulnerability published on September 30, 2026. In JetBrains YouTrack before 2026.2.19197 account takeover was possible by replaying a notification signature
When was CVE-2026-100277 disclosed?
CVE-2026-100277 was first published on September 30, 2026, with the most recent update on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-100277 actively exploited?
CVE-2026-100277 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100277?
CVE-2026-100277 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-100277?
No fix for CVE-2026-100277 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-2026-100277 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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