CVE-2026-16378

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-21. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

Other issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

July 21, 2026

Last Modified

July 24, 2026

Advisory Details (2)

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

Security Vulnerabilities fixed in Firefox 153 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-68/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=2038868

Vendor Advisories for CVE-2026-16378(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 20× in last 7d / 113× 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 149 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-16378?
CVE-2026-16378 is a high vulnerability published on July 21, 2026. Other issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
When was CVE-2026-16378 disclosed?
CVE-2026-16378 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16378 actively exploited?
CVE-2026-16378 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 65.4% of all scored CVEs.
What is the CVSS score of CVE-2026-16378?
CVE-2026-16378 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16378?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16378, 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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