CVE-2026-8945

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-19. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:mozilla, epss, ghsa
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
29.0%
KEV
Not listed

Published

May 19, 2026

Last Modified

June 30, 2026

Advisory Details (2)

Auto-updated Jun 7, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Firefox 151 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-46/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2003171

Vendor Advisories for CVE-2026-8945(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 66× 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 128 total refreshes for this CVE.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:16 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 06:31 UTCEPSS rescore
  10. 2026-07-04 06:31 UTCEPSS rescore
  11. 2026-07-01 15:07 UTCEPSS rescore
  12. 2026-06-30 23:22 UTCEPSS rescore
  13. 2026-06-29 20:57 UTCEG score recompute
  14. 2026-06-29 20:57 UTCGHSA enrichment
  15. 2026-06-29 14:06 UTCEPSS rescore
  16. 2026-06-28 14:07 UTCEPSS rescore
  17. 2026-06-28 10:47 UTCEG score recompute
  18. 2026-06-28 10:47 UTCGHSA enrichment
  19. 2026-06-28 04:56 UTCEPSS rescore
  20. 2026-06-27 21:33 UTCEG score recompute
  21. 2026-06-27 21:33 UTCGHSA enrichment
  22. 2026-06-27 08:39 UTCEG score recompute
  23. 2026-06-27 08:39 UTCGHSA enrichment
  24. 2026-06-27 03:08 UTCEPSS rescore
  25. 2026-06-26 19:50 UTCEG score recompute
Show 75 more
  1. 2026-06-26 19:50 UTCGHSA enrichment
  2. 2026-06-25 17:14 UTCEG score recompute
  3. 2026-06-25 17:14 UTCGHSA enrichment
  4. 2026-06-25 13:50 UTCEPSS rescore
  5. 2026-06-24 14:05 UTCEPSS rescore
  6. 2026-06-23 21:33 UTCEPSS rescore
  7. 2026-06-22 14:25 UTCEPSS rescore
  8. 2026-06-21 14:56 UTCEPSS rescore
  9. 2026-06-21 01:59 UTCEPSS rescore
  10. 2026-06-19 19:26 UTCEPSS rescore
  11. 2026-06-18 17:52 UTCEPSS rescore
  12. 2026-06-18 02:12 UTCEG score recompute
  13. 2026-06-18 02:12 UTCGHSA enrichment
  14. 2026-06-17 17:53 UTCEPSS rescore
  15. 2026-06-17 11:52 UTCEG score recompute
  16. 2026-06-17 11:52 UTCGHSA enrichment
  17. 2026-06-16 21:18 UTCEG score recompute
  18. 2026-06-16 21:18 UTCGHSA enrichment
  19. 2026-06-16 17:53 UTCEPSS rescore
  20. 2026-06-16 05:25 UTCEG score recompute
  21. 2026-06-16 05:25 UTCGHSA enrichment
  22. 2026-06-15 17:49 UTCEPSS rescore
  23. 2026-06-15 17:49 UTCEPSS rescore
  24. 2026-06-15 16:35 UTCEG score recompute
  25. 2026-06-15 16:35 UTCGHSA enrichment
  26. 2026-06-15 00:24 UTCEG score recompute
  27. 2026-06-15 00:23 UTCGHSA enrichment
  28. 2026-06-14 23:18 UTCEPSS rescore
  29. 2026-06-14 11:33 UTCEG score recompute
  30. 2026-06-14 11:33 UTCGHSA enrichment
  31. 2026-06-13 23:00 UTCEPSS rescore
  32. 2026-06-13 22:44 UTCEG score recompute
  33. 2026-06-13 22:44 UTCGHSA enrichment
  34. 2026-06-13 02:31 UTCEG score recompute
  35. 2026-06-13 02:31 UTCGHSA enrichment
  36. 2026-06-12 23:12 UTCEPSS rescore
  37. 2026-06-12 23:12 UTCEPSS rescore
  38. 2026-06-12 13:41 UTCEG score recompute
  39. 2026-06-12 13:41 UTCGHSA enrichment
  40. 2026-06-12 00:52 UTCEG score recompute
  41. 2026-06-12 00:52 UTCGHSA enrichment
  42. 2026-06-11 14:00 UTCEPSS rescore
  43. 2026-06-11 12:02 UTCEG score recompute
  44. 2026-06-11 12:02 UTCGHSA enrichment
  45. 2026-06-10 23:13 UTCEG score recompute
  46. 2026-06-10 23:13 UTCGHSA enrichment
  47. 2026-06-10 22:19 UTCEPSS rescore
  48. 2026-06-10 13:22 UTCEPSS rescore
  49. 2026-06-10 10:23 UTCEG score recompute
  50. 2026-06-10 10:23 UTCGHSA enrichment
  51. 2026-06-09 21:33 UTCEG score recompute
  52. 2026-06-09 21:33 UTCGHSA enrichment
  53. 2026-06-09 08:25 UTCEG score recompute
  54. 2026-06-09 08:25 UTCGHSA enrichment
  55. 2026-06-08 19:35 UTCEG score recompute
  56. 2026-06-08 19:35 UTCGHSA enrichment
  57. 2026-06-08 14:17 UTCEPSS rescore
  58. 2026-06-08 03:49 UTCEG score recompute
  59. 2026-06-08 03:49 UTCGHSA enrichment
  60. 2026-06-07 15:25 UTCEPSS rescore
  61. 2026-06-07 15:00 UTCEG score recompute
  62. 2026-06-07 15:00 UTCGHSA enrichment
  63. 2026-06-07 02:10 UTCEG score recompute
  64. 2026-06-07 02:10 UTCGHSA enrichment
  65. 2026-06-06 13:47 UTCEPSS rescore
  66. 2026-06-06 13:20 UTCEG score recompute
  67. 2026-06-06 13:20 UTCGHSA enrichment
  68. 2026-06-06 00:30 UTCEG score recompute
  69. 2026-06-06 00:30 UTCGHSA enrichment
  70. 2026-06-05 22:47 UTCEPSS rescore
  71. 2026-06-05 11:41 UTCEG score recompute
  72. 2026-06-05 11:41 UTCGHSA enrichment
  73. 2026-06-05 06:10 UTCEPSS rescore
  74. 2026-06-04 22:52 UTCEG score recompute
  75. 2026-06-04 22:52 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-8945?
CVE-2026-8945 is a high vulnerability published on May 19, 2026. Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.
When was CVE-2026-8945 disclosed?
CVE-2026-8945 was first published in the National Vulnerability Database on May 19, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8945 actively exploited?
CVE-2026-8945 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8945?
CVE-2026-8945 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-8945?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8945, 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.

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