CVE-2026-74984

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

Score 6.8 from GitHub Security Advisory published 2026-08-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.8Exploit: None knownExposed services: Not assessed

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

Race condition in the JavaScript Engine component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CVSS v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100CISA SSVC

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
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
18th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 18, 2026

Last Modified

August 25, 2026

Advisory Details (5)

Auto-updated Aug 20, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 153.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-80/
generic

Security Vulnerabilities fixed in Thunderbird 154 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-78/
generic

Security Vulnerabilities fixed in Firefox ESR 153.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-77/
generic

Security Vulnerabilities fixed in Firefox 154 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-74/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2053670

Vendor Advisories for CVE-2026-74984(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 69× 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 124 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-74984?
CVE-2026-74984 is a medium vulnerability published on August 18, 2026. Race condition in the JavaScript Engine component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
When was CVE-2026-74984 disclosed?
CVE-2026-74984 was first published on August 18, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74984 actively exploited?
CVE-2026-74984 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-74984?
CVE-2026-74984 has a CVSS v3.1 base score of 6.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-74984?
No fix for CVE-2026-74984 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-74984 are linked in the Vendor Advisories panel on this page.

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