CVE-2026-92050

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
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=2061387

Vendor Advisories for CVE-2026-92050(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 / 36× 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. 2026-09-24 02:12 UTCGHSA enrichment
  2. 2026-09-23 21:55 UTCEG score recompute
  3. 2026-09-23 21:55 UTCGHSA enrichment
  4. 2026-09-23 17:54 UTCEPSS rescore
  5. 2026-09-23 17:39 UTCGHSA enrichment
  6. 2026-09-23 13:21 UTCGHSA enrichment
  7. 2026-09-23 09:02 UTCGHSA enrichment
  8. 2026-09-23 04:45 UTCGHSA enrichment
  9. 2026-09-23 00:28 UTCGHSA enrichment
  10. 2026-09-22 20:10 UTCEG score recompute
  11. 2026-09-22 20:10 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 15:53 UTCGHSA enrichment
  14. 2026-09-22 11:36 UTCGHSA enrichment
  15. 2026-09-22 07:19 UTCGHSA enrichment
  16. 2026-09-22 03:02 UTCGHSA enrichment
  17. 2026-09-21 22:46 UTCEG score recompute
  18. 2026-09-21 22:46 UTCGHSA enrichment
  19. 2026-09-21 21:09 UTCEPSS rescore
  20. 2026-09-21 18:28 UTCGHSA enrichment
  21. 2026-09-21 17:45 UTCEG score recompute▲ 9.10
  22. 2026-09-21 17:45 UTCGHSA enrichment
  23. 2026-09-21 17:45 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  24. 2026-09-20 20:16 UTCEPSS rescore
  25. 2026-09-20 01:47 UTCGHSA enrichment
Show 11 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 19:32 UTCEPSS rescore
  3. 2026-09-16 19:57 UTCEG score recompute
  4. 2026-09-16 19:57 UTCGHSA enrichment
  5. 2026-09-16 14:09 UTCEPSS rescore
  6. 2026-09-15 20:45 UTCGHSA enrichment
  7. 2026-09-15 20:32 UTCNVD update
  8. 2026-09-15 20:19 UTCMITRE cvelistV5
  9. 2026-09-15 13:30 UTCNVD update
  10. 2026-09-15 12:38 UTCEG score recompute
  11. 2026-09-15 12:37 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-92050?
CVE-2026-92050 is a critical vulnerability published on September 15, 2026. Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.
When was CVE-2026-92050 disclosed?
CVE-2026-92050 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-2026-92050 actively exploited?
CVE-2026-92050 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 84.0% of all scored CVEs.
What is the CVSS score of CVE-2026-92050?
CVE-2026-92050 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-92050?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-92050, 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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