CVE-2026-6760

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-04-21. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:mozilla, epss, ghsa
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

April 21, 2026

Last Modified

May 26, 2026

Advisory Details (3)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 150 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-33/
generic

Security Vulnerabilities fixed in Firefox 150 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-30/
generic

2016923 - (CVE-2026-6760) PCookieStore::GetRequestOnMainThread missing CheckContentProcessSecurity - cross-origin cookie read

https://bugzilla.mozilla.org/show_bug.cgi?id=2016923

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 27× 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 245 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-6760?
CVE-2026-6760 is a critical vulnerability published on April 21, 2026. Mitigation bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
When was CVE-2026-6760 disclosed?
CVE-2026-6760 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on May 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6760 actively exploited?
CVE-2026-6760 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 79.7% of all scored CVEs.
What is the CVSS score of CVE-2026-6760?
CVE-2026-6760 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-6760?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6760, 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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