CVE-2026-74978

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 0

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

Clickjacking issue in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 25, 2026

Advisory Details (5)

Auto-updated Aug 18, 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=2036097

Vendor Advisories for CVE-2026-74978(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 23× in last 7d / 106× 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 119 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-74978?
CVE-2026-74978 is a high vulnerability published on August 18, 2026. Clickjacking issue in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
When was CVE-2026-74978 disclosed?
CVE-2026-74978 was first published in the National Vulnerability Database 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-2026-74978 actively exploited?
CVE-2026-74978 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 86.0% of all scored CVEs.
What is the CVSS score of CVE-2026-74978?
CVE-2026-74978 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-74978?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74978, 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

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