CVE-2026-74981

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.

Site isolation issue in the Audio/Video: Web Codecs 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
4%
KEV
Not listed

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=2050480

Vendor Advisories for CVE-2026-74981(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 21× in last 7d / 103× 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 116 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-74981?
CVE-2026-74981 is a high vulnerability published on August 18, 2026. Site isolation issue in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
When was CVE-2026-74981 disclosed?
CVE-2026-74981 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-2026-74981 actively exploited?
CVE-2026-74981 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 95.6% of all scored CVEs.
What is the CVSS score of CVE-2026-74981?
CVE-2026-74981 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-74981?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74981, 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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