CVE-2026-16398

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.

Site isolation issue in the Graphics 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
4%
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=2048345

Vendor Advisories for CVE-2026-16398(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 89× 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 179 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-16398?
CVE-2026-16398 is a high vulnerability published on July 21, 2026. Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
When was CVE-2026-16398 disclosed?
CVE-2026-16398 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-2026-16398 actively exploited?
CVE-2026-16398 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-2026-16398?
CVE-2026-16398 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-16398?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16398, 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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