CVE-2026-92018

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreHIGH confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this week
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.6Exploit: None knownExposed: 0

A fix is available — apply it.

Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

CVSS v3
9.6
EG Score
9.6(high)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity96% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 20, 2026

Advisory Details (8)

Auto-updated Sep 22, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 153.3 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-96/
generic

Security Vulnerabilities fixed in Thunderbird 140.16 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-95/
generic

Security Vulnerabilities fixed in Thunderbird 156 — Mozilla

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

Security Vulnerabilities fixed in Firefox ESR 153.3 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-93/
generic

Security Vulnerabilities fixed in Firefox ESR 140.16 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-92/
generic

Security Vulnerabilities fixed in Firefox ESR 115.41 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-91/
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=2064287

Vendor Advisories for CVE-2026-92018(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatthunderbird-0:140.16.0-1.el9_82026-09-24redhat
redhatfirefox-0:140.16.0-1.el10_22026-09-21redhat
redhatfirefox-0:140.16.0-1.el9_82026-09-21redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 67× in last 7d / 82× 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 10:26 UTCVendor advisory
  2. 2026-09-25 10:26 UTCGHSA enrichment
  3. 2026-09-25 06:11 UTCVendor advisory
  4. 2026-09-25 06:11 UTCGHSA enrichment
  5. 2026-09-25 01:56 UTCVendor advisory
  6. 2026-09-25 01:56 UTCGHSA enrichment
  7. 2026-09-24 21:41 UTCVendor advisory
  8. 2026-09-24 21:41 UTCGHSA enrichment
  9. 2026-09-24 16:42 UTCEG score recompute
  10. 2026-09-24 16:42 UTCVendor advisory
  11. 2026-09-24 16:42 UTCGHSA enrichment
  12. 2026-09-24 14:04 UTCEPSS rescore
  13. 2026-09-24 12:23 UTCVendor advisory
  14. 2026-09-24 12:23 UTCGHSA enrichment
  15. 2026-09-24 08:07 UTCVendor advisory
  16. 2026-09-24 08:07 UTCGHSA enrichment
  17. 2026-09-24 03:53 UTCVendor advisory
  18. 2026-09-24 03:53 UTCGHSA enrichment
  19. 2026-09-23 23:36 UTCVendor advisory
  20. 2026-09-23 23:36 UTCGHSA enrichment
  21. 2026-09-23 19:22 UTCEG score recompute
  22. 2026-09-23 19:22 UTCVendor advisory
  23. 2026-09-23 19:21 UTCGHSA enrichment
  24. 2026-09-23 17:54 UTCEPSS rescore
  25. 2026-09-23 15:00 UTCVendor advisory
Show 57 more
  1. 2026-09-23 15:00 UTCGHSA enrichment
  2. 2026-09-23 10:45 UTCVendor advisory
  3. 2026-09-23 10:45 UTCGHSA enrichment
  4. 2026-09-23 06:28 UTCVendor advisory
  5. 2026-09-23 06:28 UTCGHSA enrichment
  6. 2026-09-23 02:13 UTCVendor advisory
  7. 2026-09-23 02:13 UTCGHSA enrichment
  8. 2026-09-22 21:58 UTCVendor advisory
  9. 2026-09-22 21:58 UTCGHSA enrichment
  10. 2026-09-22 17:42 UTCEG score recompute
  11. 2026-09-22 17:42 UTCVendor advisory
  12. 2026-09-22 17:42 UTCGHSA enrichment
  13. 2026-09-22 16:01 UTCEPSS rescore
  14. 2026-09-22 13:16 UTCVendor advisory
  15. 2026-09-22 13:16 UTCGHSA enrichment
  16. 2026-09-22 09:02 UTCVendor advisory
  17. 2026-09-22 09:02 UTCGHSA enrichment
  18. 2026-09-22 04:38 UTCVendor advisory
  19. 2026-09-22 04:38 UTCGHSA enrichment
  20. 2026-09-22 00:22 UTCEG score recompute
  21. 2026-09-22 00:22 UTCVendor advisory
  22. 2026-09-22 00:22 UTCGHSA enrichment
  23. 2026-09-21 21:09 UTCEPSS rescore
  24. 2026-09-21 20:07 UTCGHSA enrichment
  25. 2026-09-21 15:52 UTCGHSA enrichment
  26. 2026-09-21 11:37 UTCGHSA enrichment
  27. 2026-09-21 07:22 UTCGHSA enrichment
  28. 2026-09-21 03:03 UTCGHSA enrichment
  29. 2026-09-20 22:48 UTCEG score recompute
  30. 2026-09-20 22:48 UTCGHSA enrichment
  31. 2026-09-20 20:16 UTCEPSS rescore
  32. 2026-09-20 18:33 UTCGHSA enrichment
  33. 2026-09-20 14:18 UTCGHSA enrichment
  34. 2026-09-20 10:03 UTCGHSA enrichment
  35. 2026-09-20 05:47 UTCEG score recompute
  36. 2026-09-20 05:47 UTCGHSA enrichment
  37. 2026-09-20 01:32 UTCGHSA enrichment
  38. 2026-09-20 01:01 UTCEG score recompute▲ 9.60
  39. 2026-09-20 01:01 UTCGHSA enrichment
  40. 2026-09-20 01:00 UTCMITRE cvelistV5CVSS v3 → 9.6 · severity → CRITICAL
  41. 2026-09-19 15:09 UTCGHSA enrichment
  42. 2026-09-18 19:28 UTCEPSS rescore
  43. 2026-09-17 19:32 UTCEPSS rescore
  44. 2026-09-16 19:58 UTCGHSA enrichment
  45. 2026-09-16 15:28 UTCGHSA enrichment
  46. 2026-09-16 15:19 UTCNVD update
  47. 2026-09-16 14:38 UTCEG score recompute
  48. 2026-09-16 14:38 UTCGHSA enrichment
  49. 2026-09-16 14:35 UTCMITRE cvelistV5
  50. 2026-09-16 14:09 UTCEPSS rescore
  51. 2026-09-15 20:46 UTCGHSA enrichment
  52. 2026-09-15 20:32 UTCNVD update
  53. 2026-09-15 19:49 UTCGHSA enrichment
  54. 2026-09-15 19:47 UTCMITRE cvelistV5
  55. 2026-09-15 13:30 UTCNVD update
  56. 2026-09-15 12:39 UTCEG score recompute
  57. 2026-09-15 12:37 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-92018?
CVE-2026-92018 is a critical vulnerability published on September 15, 2026. Sandbox escape in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
When was CVE-2026-92018 disclosed?
CVE-2026-92018 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-92018 actively exploited?
CVE-2026-92018 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 74.1% of all scored CVEs.
What is the CVSS score of CVE-2026-92018?
CVE-2026-92018 has a CVSS v3.1 base score of 9.6 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-92018?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-92018, 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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