CVE-2026-4711

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS v3
9.8
EG Score
9.8(medium)
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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

March 24, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Sep 14, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 140.9 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-24/
generic

Security Vulnerabilities fixed in Thunderbird 149 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-23/
generic

Security Vulnerabilities fixed in Firefox ESR 140.9 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-22/
generic

Security Vulnerabilities fixed in Firefox 149 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-20/
generic

2017002 - (CVE-2026-4711) Use-after-free in macOS sharing service

https://bugzilla.mozilla.org/show_bug.cgi?id=2017002

Vendor Advisories for CVE-2026-4711(20)

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

Patch Availability(25)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatthunderbird-0:140.9.0-1.el8_42026-04-20redhat
redhatfirefox-0:140.9.0-1.el7_92026-04-16redhat
redhatthunderbird-0:140.9.0-1.el9_02026-04-15redhat
redhatthunderbird-0:140.9.0-1.el9_62026-04-15redhat
redhatthunderbird-0:140.9.0-1.el8_62026-04-15redhat
redhatthunderbird-0:140.9.0-1.el10_02026-04-15redhat
redhatthunderbird-0:140.9.0-1.el9_42026-04-15redhat
redhatthunderbird-0:140.9.0-1.el9_22026-04-15redhat
redhatthunderbird-0:140.9.0-1.el8_82026-04-15redhat
redhatthunderbird-0:140.9.0-1.el8_22026-04-15redhat
redhatfirefox-0:140.9.0-1.el8_42026-04-13redhat
redhatfirefox-0:140.9.0-1.el9_02026-04-13redhat
redhatfirefox-0:140.9.0-1.el8_22026-04-13redhat
redhatfirefox-0:140.9.0-1.el9_22026-04-13redhat
redhatfirefox-0:140.9.0-1.el9_62026-04-13redhat
redhatfirefox-0:140.9.0-1.el10_02026-04-13redhat
redhatfirefox-0:140.9.0-1.el8_82026-04-13redhat
redhatfirefox-0:140.9.0-1.el8_62026-04-13redhat
redhatfirefox-0:140.9.0-1.el9_42026-04-13redhat
redhatthunderbird-0:140.9.0-1.el8_102026-04-07redhat
redhatthunderbird-0:140.9.0-1.el10_12026-04-01redhat
redhatthunderbird-0:140.9.0-1.el9_72026-03-30redhat
redhatfirefox-0:140.9.0-1.el10_12026-03-26redhat
redhatfirefox-0:140.9.0-1.el9_72026-03-26redhat
redhatfirefox-0:140.9.0-1.el8_102026-03-26redhat

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

(5)

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 4× in last 7d / 22× 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.

Showing the most recent 100 of 247 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-16 14:08 UTCEPSS rescore
  3. 2026-09-16 05:15 UTCEPSS rescore
  4. 2026-09-13 16:47 UTCEPSS rescore
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-10 09:35 UTCEPSS rescore
  7. 2026-09-08 22:01 UTCEPSS rescore
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-04 05:06 UTCEPSS rescore
  11. 2026-09-02 14:12 UTCEPSS rescore
  12. 2026-09-01 13:54 UTCEPSS rescore
  13. 2026-09-01 04:40 UTCEPSS rescore
  14. 2026-08-30 19:17 UTCEPSS rescore
  15. 2026-08-30 01:22 UTCEPSS rescore
  16. 2026-08-28 21:41 UTCEPSS rescore
  17. 2026-08-27 14:25 UTCEPSS rescore
  18. 2026-08-26 14:46 UTCEPSS rescore
  19. 2026-08-25 13:49 UTCEPSS rescore
  20. 2026-08-23 00:19 UTCEPSS rescore
  21. 2026-08-21 23:49 UTCEPSS rescore
  22. 2026-08-20 22:55 UTCEPSS rescore
  23. 2026-08-19 17:04 UTCEPSS rescore
  24. 2026-08-18 13:48 UTCEPSS rescore
  25. 2026-08-17 13:47 UTCEPSS rescore
Show 75 more
  1. 2026-08-16 14:56 UTCEPSS rescore
  2. 2026-08-16 10:39 UTCEG score recompute
  3. 2026-08-16 10:39 UTCVendor advisory
  4. 2026-08-16 10:39 UTCGHSA enrichment
  5. 2026-08-16 02:14 UTCEPSS rescore
  6. 2026-08-15 01:30 UTCEPSS rescore
  7. 2026-08-14 23:36 UTCVendor advisory
  8. 2026-08-14 23:36 UTCGHSA enrichment
  9. 2026-08-14 19:41 UTCVendor advisory
  10. 2026-08-14 19:41 UTCGHSA enrichment
  11. 2026-08-14 14:40 UTCVendor advisory
  12. 2026-08-14 14:40 UTCGHSA enrichment
  13. 2026-08-14 10:46 UTCVendor advisory
  14. 2026-08-14 10:46 UTCGHSA enrichment
  15. 2026-08-14 06:52 UTCEG score recompute
  16. 2026-08-14 06:52 UTCVendor advisory
  17. 2026-08-14 06:52 UTCGHSA enrichment
  18. 2026-08-13 22:00 UTCEPSS rescore
  19. 2026-08-13 01:25 UTCVendor advisory
  20. 2026-08-13 01:25 UTCGHSA enrichment
  21. 2026-08-12 21:31 UTCEG score recompute
  22. 2026-08-12 21:31 UTCVendor advisory
  23. 2026-08-12 21:31 UTCGHSA enrichment
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-12 01:10 UTCVendor advisory
  26. 2026-08-12 01:10 UTCGHSA enrichment
  27. 2026-08-11 21:08 UTCEG score recompute
  28. 2026-08-11 21:08 UTCVendor advisory
  29. 2026-08-11 21:08 UTCGHSA enrichment
  30. 2026-08-11 08:29 UTCVendor advisory
  31. 2026-08-11 08:29 UTCGHSA enrichment
  32. 2026-08-11 04:11 UTCEG score recompute
  33. 2026-08-11 04:11 UTCVendor advisory
  34. 2026-08-11 04:11 UTCGHSA enrichment
  35. 2026-08-11 00:00 UTCEPSS rescore
  36. 2026-08-10 12:52 UTCVendor advisory
  37. 2026-08-10 12:52 UTCGHSA enrichment
  38. 2026-08-10 08:49 UTCVendor advisory
  39. 2026-08-10 08:49 UTCGHSA enrichment
  40. 2026-08-10 04:55 UTCVendor advisory
  41. 2026-08-10 04:55 UTCGHSA enrichment
  42. 2026-08-10 01:00 UTCVendor advisory
  43. 2026-08-10 01:00 UTCGHSA enrichment
  44. 2026-08-09 21:06 UTCVendor advisory
  45. 2026-08-09 21:06 UTCGHSA enrichment
  46. 2026-08-09 17:12 UTCEG score recompute
  47. 2026-08-09 17:12 UTCVendor advisory
  48. 2026-08-09 17:12 UTCGHSA enrichment
  49. 2026-08-09 13:46 UTCEPSS rescore
  50. 2026-08-09 13:17 UTCVendor advisory
  51. 2026-08-09 13:17 UTCGHSA enrichment
  52. 2026-08-09 06:27 UTCVendor advisory
  53. 2026-08-09 06:27 UTCGHSA enrichment
  54. 2026-08-08 08:25 UTCVendor advisory
  55. 2026-08-08 08:25 UTCGHSA enrichment
  56. 2026-08-08 04:31 UTCVendor advisory
  57. 2026-08-08 04:31 UTCGHSA enrichment
  58. 2026-08-08 00:37 UTCVendor advisory
  59. 2026-08-08 00:37 UTCGHSA enrichment
  60. 2026-08-07 20:42 UTCVendor advisory
  61. 2026-08-07 20:42 UTCGHSA enrichment
  62. 2026-08-07 16:48 UTCEG score recompute
  63. 2026-08-07 16:48 UTCVendor advisory
  64. 2026-08-07 16:48 UTCGHSA enrichment
  65. 2026-08-06 19:05 UTCEG score recompute
  66. 2026-08-06 19:05 UTCVendor advisory
  67. 2026-08-06 19:05 UTCGHSA enrichment
  68. 2026-08-06 13:47 UTCEPSS rescore
  69. 2026-08-06 09:00 UTCVendor advisory
  70. 2026-08-06 09:00 UTCGHSA enrichment
  71. 2026-08-06 05:06 UTCVendor advisory
  72. 2026-08-06 05:06 UTCGHSA enrichment
  73. 2026-08-06 01:12 UTCEG score recompute
  74. 2026-08-06 01:12 UTCVendor advisory
  75. 2026-08-06 01:12 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-4711?
CVE-2026-4711 is a critical vulnerability published on March 24, 2026. Use-after-free in the Widget: Cocoa component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
When was CVE-2026-4711 disclosed?
CVE-2026-4711 was first published in the National Vulnerability Database on March 24, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4711 actively exploited?
CVE-2026-4711 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 66.2% of all scored CVEs.
What is the CVSS score of CVE-2026-4711?
CVE-2026-4711 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-4711?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4711, 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-2026-4711

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