CVE-2026-8970

HIGHNVD 8.87.3▼
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-05-19. NVD baseline CVSS 8.8; sources differ by 1.5.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS v3
8.8
EG Score
7.3(medium)
EPSS
22.5%
KEV
Not listed

Published

May 19, 2026

Last Modified

May 20, 2026

Advisory Details (5)

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

Security Vulnerabilities fixed in Thunderbird 140.11 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-51/
generic

Security Vulnerabilities fixed in Thunderbird 151 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-50/
generic

Security Vulnerabilities fixed in Firefox ESR 140.11 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-48/
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=2032174

Vendor Advisories for CVE-2026-8970(20)

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

Patch Availability(21)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatfirefox-0:140.11.0-1.el10_02026-06-22redhat
redhatfirefox-0:140.11.0-1.el8_42026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_62026-06-17redhat
redhatthunderbird-0:140.11.0-1.el9_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_22026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_42026-06-17redhat
redhatthunderbird-0:140.11.0-1.el10_02026-06-17redhat
redhatfirefox-0:140.11.0-1.el8_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el7_92026-06-17redhat
redhatthunderbird-0:140.11.0-1.el8_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el8_82026-06-17redhat
redhatthunderbird-0:140.11.0-1.el9_22026-06-16redhat
redhatthunderbird-0:140.11.0-1.el8_42026-06-16redhat
redhatthunderbird-0:140.11.0-1.el9_42026-06-16redhat
redhatthunderbird-0:140.11.0-1.el8_82026-06-16redhat
redhatthunderbird-0:140.11.0-1.el8_102026-06-03redhat
redhatthunderbird-0:140.11.0-1.el10_22026-06-01redhat
redhatthunderbird-0:140.11.0-1.el9_82026-05-27redhat
redhatfirefox-0:140.11.0-1.el9_82026-05-27redhat
redhatfirefox-0:140.11.0-1.el8_102026-05-27redhat
redhatfirefox-0:140.11.0-1.el10_22026-05-27redhat

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 9× in last 7d / 115× 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 171 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-8970?
CVE-2026-8970 is a high vulnerability published on May 19, 2026. Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
When was CVE-2026-8970 disclosed?
CVE-2026-8970 was first published in the National Vulnerability Database on May 19, 2026, with the most recent update on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8970 actively exploited?
CVE-2026-8970 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8970?
CVE-2026-8970 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.3.
How do I remediate CVE-2026-8970?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8970, 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-2026-8970

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