CVE-2026-4728

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-03-24. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

Spoofing issue in the Privacy: Anti-Tracking component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

March 24, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Aug 6, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 149 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-23/
generic

Security Vulnerabilities fixed in Firefox 149 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-20/
generic

2013179 - (CVE-2026-4728) ContentParent::RecvSetAllowStorageAccessRequestFlag missing ValidatePrincipal check allows unvalidated principals to grant storage access permissions

https://bugzilla.mozilla.org/show_bug.cgi?id=2013179

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 19× 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 156 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-4728?
CVE-2026-4728 is a medium vulnerability published on March 24, 2026. Spoofing issue in the Privacy: Anti-Tracking component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
When was CVE-2026-4728 disclosed?
CVE-2026-4728 was first published in the National Vulnerability Database on March 24, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4728 actively exploited?
CVE-2026-4728 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 85.3% of all scored CVEs.
What is the CVSS score of CVE-2026-4728?
CVE-2026-4728 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-4728?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4728, 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.

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