CVE-2026-92027

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

Use-after-free in the DOM: Streams 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
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 18, 2026

Advisory Details (8)

Auto-updated Sep 18, 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=2068433

Vendor Advisories for CVE-2026-92027(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.el9_82026-09-21redhat
redhatfirefox-0:140.16.0-1.el10_22026-09-21redhat

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 38× in last 7d / 53× 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 07:27 UTCVendor advisory
  2. 2026-09-25 07:27 UTCGHSA enrichment
  3. 2026-09-24 19:57 UTCEG score recompute
  4. 2026-09-24 19:57 UTCVendor advisory
  5. 2026-09-24 19:57 UTCGHSA enrichment
  6. 2026-09-24 14:04 UTCEPSS rescore
  7. 2026-09-24 08:27 UTCVendor advisory
  8. 2026-09-24 08:27 UTCGHSA enrichment
  9. 2026-09-23 20:57 UTCEG score recompute
  10. 2026-09-23 20:57 UTCVendor advisory
  11. 2026-09-23 20:57 UTCGHSA enrichment
  12. 2026-09-23 17:54 UTCEPSS rescore
  13. 2026-09-23 09:28 UTCVendor advisory
  14. 2026-09-23 09:28 UTCGHSA enrichment
  15. 2026-09-22 21:58 UTCEG score recompute
  16. 2026-09-22 21:58 UTCVendor advisory
  17. 2026-09-22 21:58 UTCGHSA enrichment
  18. 2026-09-22 16:01 UTCEPSS rescore
  19. 2026-09-22 10:28 UTCVendor advisory
  20. 2026-09-22 10:28 UTCGHSA enrichment
  21. 2026-09-21 22:58 UTCEG score recompute
  22. 2026-09-21 22:57 UTCGHSA enrichment
  23. 2026-09-21 21:09 UTCEPSS rescore
  24. 2026-09-21 11:27 UTCGHSA enrichment
  25. 2026-09-20 23:58 UTCEG score recompute
Show 28 more
  1. 2026-09-20 23:58 UTCGHSA enrichment
  2. 2026-09-20 20:16 UTCEPSS rescore
  3. 2026-09-20 12:28 UTCGHSA enrichment
  4. 2026-09-20 00:51 UTCEG score recompute
  5. 2026-09-20 00:51 UTCGHSA enrichment
  6. 2026-09-19 13:21 UTCGHSA enrichment
  7. 2026-09-19 01:51 UTCEG score recompute
  8. 2026-09-19 01:51 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 14:22 UTCGHSA enrichment
  11. 2026-09-18 13:44 UTCEG score recompute▲ 8.80
  12. 2026-09-18 13:44 UTCGHSA enrichment
  13. 2026-09-18 13:44 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  14. 2026-09-17 19:32 UTCEPSS rescore
  15. 2026-09-16 19:58 UTCGHSA enrichment
  16. 2026-09-16 15:27 UTCGHSA enrichment
  17. 2026-09-16 15:19 UTCNVD update
  18. 2026-09-16 14:37 UTCEG score recompute
  19. 2026-09-16 14:37 UTCGHSA enrichment
  20. 2026-09-16 14:35 UTCMITRE cvelistV5
  21. 2026-09-16 14:09 UTCEPSS rescore
  22. 2026-09-15 20:45 UTCGHSA enrichment
  23. 2026-09-15 20:32 UTCNVD update
  24. 2026-09-15 19:49 UTCGHSA enrichment
  25. 2026-09-15 19:47 UTCMITRE cvelistV5
  26. 2026-09-15 13:30 UTCNVD update
  27. 2026-09-15 12:39 UTCEG score recompute
  28. 2026-09-15 12:37 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-92027?
CVE-2026-92027 is a high vulnerability published on September 15, 2026. Use-after-free in the DOM: Streams 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-2026-92027 disclosed?
CVE-2026-92027 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-92027 actively exploited?
CVE-2026-92027 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 75.3% of all scored CVEs.
What is the CVSS score of CVE-2026-92027?
CVE-2026-92027 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-92027?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-92027, 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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