CVE-2026-8970

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 76% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated 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.

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
8.8(medium)
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
23%
KEV
Not listed

Published

May 19, 2026

Last Modified

July 23, 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_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el7_92026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_62026-06-17redhat
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.el10_02026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_42026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_22026-06-17redhat
redhatfirefox-0:140.11.0-1.el8_42026-06-17redhat
redhatthunderbird-0:140.11.0-1.el9_62026-06-17redhat
redhatthunderbird-0:140.11.0-1.el9_22026-06-16redhat
redhatthunderbird-0:140.11.0-1.el8_82026-06-16redhat
redhatthunderbird-0:140.11.0-1.el9_42026-06-16redhat
redhatthunderbird-0:140.11.0-1.el8_42026-06-16redhat
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.

Affected Packages

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.1.0esr-1 ... 91.9.1esr-1~deb9u1 (275 versions)140.11.0esr-1~deb11u1—
thunderbird1:102.0.1-1 ... 1:91.9.0-1~deb9u1 (326 versions)1:140.11.0esr-1~deb11u1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr102.11.0esr-1 ... 140.9.1esr-1~deb13u1 (182 versions)140.11.0esr-1~deb12u1—
thunderbird1:102.11.0-1 ... 1:140.9.1esr-1~deb13u1 (211 versions)1:140.11.0esr-1~deb12u1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (58 versions)140.11.0esr-1~deb13u1—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (67 versions)1:140.11.0esr-1~deb13u1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr128.13.0esr-1 ... 140.9.1esr-1~deb13u1 (59 versions)140.11.0esr-1—
thunderbird1:128.13.0esr-1 ... 1:140.9.1esr-1~deb13u1 (68 versions)1:140.11.0esr-1—

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 15× in last 7d / 105× 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 261 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-24 14:18 UTCEPSS rescore
  3. 2026-08-23 17:05 UTCEG score recompute
  4. 2026-08-23 17:05 UTCVendor advisory
  5. 2026-08-23 17:05 UTCGHSA enrichment
  6. 2026-08-23 00:19 UTCEPSS rescore
  7. 2026-08-21 23:49 UTCEPSS rescore
  8. 2026-08-21 23:38 UTCEG score recompute
  9. 2026-08-21 23:38 UTCVendor advisory
  10. 2026-08-21 23:38 UTCGHSA enrichment
  11. 2026-08-20 22:56 UTCEPSS rescore
  12. 2026-08-20 19:02 UTCEG score recompute
  13. 2026-08-20 19:02 UTCVendor advisory
  14. 2026-08-20 19:02 UTCGHSA enrichment
  15. 2026-08-19 17:04 UTCEPSS rescore
  16. 2026-08-18 13:49 UTCEPSS rescore
  17. 2026-08-18 13:49 UTCEPSS rescore
  18. 2026-08-17 13:47 UTCEPSS rescore
  19. 2026-08-17 10:01 UTCEG score recompute
  20. 2026-08-17 10:01 UTCVendor advisory
  21. 2026-08-17 10:01 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 03:35 UTCEG score recompute
  25. 2026-08-16 03:35 UTCVendor advisory
Show 75 more
  1. 2026-08-16 03:35 UTCGHSA enrichment
  2. 2026-08-16 02:15 UTCEPSS rescore
  3. 2026-08-15 01:55 UTCEG score recompute
  4. 2026-08-15 01:55 UTCVendor advisory
  5. 2026-08-15 01:55 UTCGHSA enrichment
  6. 2026-08-15 01:31 UTCEPSS rescore
  7. 2026-08-14 14:01 UTCVendor advisory
  8. 2026-08-14 14:01 UTCGHSA enrichment
  9. 2026-08-14 02:07 UTCEG score recompute
  10. 2026-08-14 02:07 UTCVendor advisory
  11. 2026-08-14 02:07 UTCGHSA enrichment
  12. 2026-08-13 22:00 UTCEPSS rescore
  13. 2026-08-13 02:16 UTCVendor advisory
  14. 2026-08-13 02:16 UTCGHSA enrichment
  15. 2026-08-12 14:22 UTCEG score recompute
  16. 2026-08-12 14:22 UTCVendor advisory
  17. 2026-08-12 14:22 UTCGHSA enrichment
  18. 2026-08-12 13:51 UTCEPSS rescore
  19. 2026-08-12 01:48 UTCVendor advisory
  20. 2026-08-12 01:48 UTCGHSA enrichment
  21. 2026-08-11 13:54 UTCEG score recompute
  22. 2026-08-11 13:54 UTCVendor advisory
  23. 2026-08-11 13:54 UTCGHSA enrichment
  24. 2026-08-11 13:43 UTCEPSS rescore
  25. 2026-08-11 01:12 UTCEG score recompute
  26. 2026-08-11 01:12 UTCVendor advisory
  27. 2026-08-11 01:11 UTCGHSA enrichment
  28. 2026-08-11 00:00 UTCEPSS rescore
  29. 2026-08-10 13:18 UTCVendor advisory
  30. 2026-08-10 13:18 UTCGHSA enrichment
  31. 2026-08-10 01:24 UTCEG score recompute
  32. 2026-08-10 01:24 UTCVendor advisory
  33. 2026-08-10 01:24 UTCGHSA enrichment
  34. 2026-08-09 13:47 UTCEPSS rescore
  35. 2026-08-09 13:30 UTCVendor advisory
  36. 2026-08-09 13:30 UTCGHSA enrichment
  37. 2026-08-09 01:36 UTCEG score recompute
  38. 2026-08-09 01:36 UTCVendor advisory
  39. 2026-08-09 01:36 UTCGHSA enrichment
  40. 2026-08-08 16:37 UTCEPSS rescore
  41. 2026-08-08 08:52 UTCVendor advisory
  42. 2026-08-08 08:52 UTCGHSA enrichment
  43. 2026-08-07 20:58 UTCEG score recompute
  44. 2026-08-07 20:58 UTCVendor advisory
  45. 2026-08-07 20:58 UTCGHSA enrichment
  46. 2026-08-07 16:30 UTCEPSS rescore
  47. 2026-08-07 09:04 UTCVendor advisory
  48. 2026-08-07 09:04 UTCGHSA enrichment
  49. 2026-08-06 21:10 UTCEG score recompute
  50. 2026-08-06 21:10 UTCVendor advisory
  51. 2026-08-06 21:10 UTCGHSA enrichment
  52. 2026-08-06 13:47 UTCEPSS rescore
  53. 2026-08-06 09:16 UTCVendor advisory
  54. 2026-08-06 09:16 UTCGHSA enrichment
  55. 2026-08-05 21:22 UTCEG score recompute
  56. 2026-08-05 21:22 UTCVendor advisory
  57. 2026-08-05 21:22 UTCGHSA enrichment
  58. 2026-08-05 19:17 UTCEPSS rescore
  59. 2026-08-05 19:17 UTCEPSS rescore
  60. 2026-08-04 15:10 UTCEPSS rescore
  61. 2026-08-04 10:39 UTCEPSS rescore
  62. 2026-08-04 04:53 UTCVendor advisory
  63. 2026-08-04 04:53 UTCGHSA enrichment
  64. 2026-08-03 16:59 UTCEG score recompute
  65. 2026-08-03 16:59 UTCVendor advisory
  66. 2026-08-03 16:59 UTCGHSA enrichment
  67. 2026-08-03 10:36 UTCEPSS rescore
  68. 2026-08-02 17:45 UTCVendor advisory
  69. 2026-08-02 17:45 UTCGHSA enrichment
  70. 2026-08-02 05:51 UTCEG score recompute
  71. 2026-08-02 05:51 UTCVendor advisory
  72. 2026-08-02 05:51 UTCGHSA enrichment
  73. 2026-08-02 02:27 UTCEPSS rescore
  74. 2026-08-01 17:57 UTCEG score recompute
  75. 2026-08-01 17:57 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 July 23, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 77.2% of all scored CVEs.
What is the CVSS score of CVE-2026-8970?
CVE-2026-8970 has a CVSS v3 base score of 8.8 (NVD).
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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-8970

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