CVE-2026-92066

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 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: 1%CVSS: 9.8Exploit: None knownExposed: 0

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

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 21, 2026

Advisory Details (3)

Auto-updated Sep 21, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 156 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-94/
generic

Security Vulnerabilities fixed in Firefox 156 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-90/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2058093

Vendor Advisories for CVE-2026-92066(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 36× in last 7d / 46× 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. 2026-09-25 09:54 UTCGHSA enrichment
  2. 2026-09-25 05:49 UTCGHSA enrichment
  3. 2026-09-25 01:45 UTCGHSA enrichment
  4. 2026-09-24 21:40 UTCGHSA enrichment
  5. 2026-09-24 16:52 UTCEG score recompute
  6. 2026-09-24 16:52 UTCGHSA enrichment
  7. 2026-09-24 14:04 UTCEPSS rescore
  8. 2026-09-24 12:47 UTCGHSA enrichment
  9. 2026-09-24 08:42 UTCGHSA enrichment
  10. 2026-09-24 04:38 UTCGHSA enrichment
  11. 2026-09-24 00:33 UTCGHSA enrichment
  12. 2026-09-23 20:29 UTCEG score recompute
  13. 2026-09-23 20:29 UTCGHSA enrichment
  14. 2026-09-23 17:54 UTCEPSS rescore
  15. 2026-09-23 16:24 UTCGHSA enrichment
  16. 2026-09-23 12:19 UTCGHSA enrichment
  17. 2026-09-23 08:15 UTCGHSA enrichment
  18. 2026-09-23 04:10 UTCGHSA enrichment
  19. 2026-09-23 00:06 UTCGHSA enrichment
  20. 2026-09-22 20:01 UTCEG score recompute
  21. 2026-09-22 20:01 UTCGHSA enrichment
  22. 2026-09-22 16:01 UTCEPSS rescore
  23. 2026-09-22 15:56 UTCGHSA enrichment
  24. 2026-09-22 11:50 UTCGHSA enrichment
  25. 2026-09-22 07:45 UTCGHSA enrichment
Show 21 more
  1. 2026-09-22 03:40 UTCGHSA enrichment
  2. 2026-09-21 23:35 UTCEG score recompute
  3. 2026-09-21 23:35 UTCGHSA enrichment
  4. 2026-09-21 21:09 UTCEPSS rescore
  5. 2026-09-21 19:31 UTCGHSA enrichment
  6. 2026-09-21 18:30 UTCEG score recompute▲ 9.80
  7. 2026-09-21 18:30 UTCGHSA enrichment
  8. 2026-09-21 18:30 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  9. 2026-09-20 20:16 UTCEPSS rescore
  10. 2026-09-19 14:53 UTCGHSA enrichment
  11. 2026-09-18 19:28 UTCEPSS rescore
  12. 2026-09-17 19:32 UTCEPSS rescore
  13. 2026-09-16 19:57 UTCEG score recompute
  14. 2026-09-16 19:57 UTCGHSA enrichment
  15. 2026-09-16 14:09 UTCEPSS rescore
  16. 2026-09-15 20:44 UTCGHSA enrichment
  17. 2026-09-15 20:32 UTCNVD update
  18. 2026-09-15 20:19 UTCMITRE cvelistV5
  19. 2026-09-15 13:30 UTCNVD update
  20. 2026-09-15 12:38 UTCEG score recompute
  21. 2026-09-15 12:37 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-92066?
CVE-2026-92066 is a critical vulnerability published on September 15, 2026. Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
When was CVE-2026-92066 disclosed?
CVE-2026-92066 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-92066 actively exploited?
CVE-2026-92066 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.3% of all scored CVEs.
What is the CVSS score of CVE-2026-92066?
CVE-2026-92066 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-92066?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-92066, 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-2026-92066

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