CVE-2026-8961

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-05-19. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

A fix is available — apply it.

Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
24.1%
KEV
Not listed

Published

May 19, 2026

Last Modified

May 20, 2026

Advisory Details (5)

Auto-updated Jun 13, 2026
No patch confirmed yet.
generic

Security Vulnerabilities fixed in Thunderbird 140.11 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-51/
generic

Security Vulnerabilities fixed in Thunderbird 151 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-50/
generic

Security Vulnerabilities fixed in Firefox ESR 140.11 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-48/
generic

Security Vulnerabilities fixed in Firefox 151 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2026-46/
generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=1962625

Vendor Advisories for CVE-2026-8961(20)

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

Patch Availability(21)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatfirefox-0:140.11.0-1.el10_02026-06-22redhat
redhatfirefox-0:140.11.0-1.el8_82026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_22026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el9_42026-06-17redhat
redhatthunderbird-0:140.11.0-1.el10_02026-06-17redhat
redhatthunderbird-0:140.11.0-1.el9_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el8_42026-06-17redhat
redhatthunderbird-0:140.11.0-1.el8_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el8_62026-06-17redhat
redhatfirefox-0:140.11.0-1.el7_92026-06-17redhat
redhatthunderbird-0:140.11.0-1.el8_42026-06-16redhat
redhatthunderbird-0:140.11.0-1.el8_82026-06-16redhat
redhatthunderbird-0:140.11.0-1.el9_22026-06-16redhat
redhatthunderbird-0:140.11.0-1.el9_42026-06-16redhat
redhatthunderbird-0:140.11.0-1.el8_102026-06-03redhat
redhatthunderbird-0:140.11.0-1.el10_22026-06-01redhat
redhatfirefox-0:140.11.0-1.el10_22026-05-27redhat
redhatfirefox-0:140.11.0-1.el8_102026-05-27redhat
redhatfirefox-0:140.11.0-1.el9_82026-05-27redhat
redhatthunderbird-0:140.11.0-1.el9_82026-05-27redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 74× 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 109 total refreshes for this CVE.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 02:23 UTCEPSS rescore
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-05 02:31 UTCEPSS rescore
  5. 2026-07-05 02:30 UTCEPSS rescore
  6. 2026-07-01 15:07 UTCEPSS rescore
  7. 2026-06-30 23:22 UTCEPSS rescore
  8. 2026-06-29 20:56 UTCEG score recompute
  9. 2026-06-29 20:56 UTCVendor advisory
  10. 2026-06-29 20:56 UTCGHSA enrichment
  11. 2026-06-29 14:06 UTCEPSS rescore
  12. 2026-06-28 14:07 UTCEPSS rescore
  13. 2026-06-28 04:56 UTCEPSS rescore
  14. 2026-06-27 22:06 UTCEG score recompute
  15. 2026-06-27 22:06 UTCVendor advisory
  16. 2026-06-27 22:06 UTCGHSA enrichment
  17. 2026-06-27 03:08 UTCEPSS rescore
  18. 2026-06-26 19:49 UTCEG score recompute
  19. 2026-06-26 19:49 UTCVendor advisory
  20. 2026-06-26 19:49 UTCGHSA enrichment
  21. 2026-06-25 17:11 UTCEG score recompute
  22. 2026-06-25 17:11 UTCVendor advisory
  23. 2026-06-25 17:10 UTCGHSA enrichment
  24. 2026-06-25 13:50 UTCEPSS rescore
  25. 2026-06-24 14:05 UTCEPSS rescore
Show 75 more
  1. 2026-06-23 21:33 UTCEPSS rescore
  2. 2026-06-22 14:25 UTCEPSS rescore
  3. 2026-06-21 14:56 UTCEPSS rescore
  4. 2026-06-21 01:59 UTCEPSS rescore
  5. 2026-06-19 19:26 UTCEPSS rescore
  6. 2026-06-18 17:52 UTCEPSS rescore
  7. 2026-06-17 23:43 UTCEG score recompute
  8. 2026-06-17 23:43 UTCVendor advisory
  9. 2026-06-17 23:43 UTCGHSA enrichment
  10. 2026-06-17 17:53 UTCEPSS rescore
  11. 2026-06-16 21:17 UTCEG score recompute
  12. 2026-06-16 21:17 UTCVendor advisory
  13. 2026-06-16 21:16 UTCGHSA enrichment
  14. 2026-06-16 17:53 UTCEPSS rescore
  15. 2026-06-15 17:49 UTCEPSS rescore
  16. 2026-06-15 17:49 UTCEPSS rescore
  17. 2026-06-15 16:32 UTCEG score recompute
  18. 2026-06-15 16:32 UTCVendor advisory
  19. 2026-06-15 16:32 UTCGHSA enrichment
  20. 2026-06-14 23:18 UTCEPSS rescore
  21. 2026-06-14 07:29 UTCEG score recompute
  22. 2026-06-14 07:29 UTCVendor advisory
  23. 2026-06-14 07:29 UTCGHSA enrichment
  24. 2026-06-13 23:00 UTCEPSS rescore
  25. 2026-06-13 05:17 UTCEG score recompute
  26. 2026-06-13 05:17 UTCVendor advisory
  27. 2026-06-13 05:17 UTCGHSA enrichment
  28. 2026-06-12 23:12 UTCEPSS rescore
  29. 2026-06-12 23:12 UTCEPSS rescore
  30. 2026-06-12 03:05 UTCEG score recompute
  31. 2026-06-12 03:05 UTCVendor advisory
  32. 2026-06-12 03:05 UTCGHSA enrichment
  33. 2026-06-11 14:00 UTCEPSS rescore
  34. 2026-06-11 00:53 UTCEG score recompute
  35. 2026-06-11 00:53 UTCVendor advisory
  36. 2026-06-11 00:53 UTCGHSA enrichment
  37. 2026-06-10 22:19 UTCEPSS rescore
  38. 2026-06-10 13:22 UTCEPSS rescore
  39. 2026-06-09 22:41 UTCEG score recompute
  40. 2026-06-09 22:41 UTCVendor advisory
  41. 2026-06-09 22:41 UTCGHSA enrichment
  42. 2026-06-08 20:29 UTCEG score recompute
  43. 2026-06-08 20:29 UTCVendor advisory
  44. 2026-06-08 20:29 UTCGHSA enrichment
  45. 2026-06-08 14:17 UTCEPSS rescore
  46. 2026-06-07 18:18 UTCEG score recompute
  47. 2026-06-07 18:18 UTCVendor advisory
  48. 2026-06-07 18:18 UTCGHSA enrichment
  49. 2026-06-07 15:25 UTCEPSS rescore
  50. 2026-06-06 16:06 UTCEG score recompute
  51. 2026-06-06 16:06 UTCVendor advisory
  52. 2026-06-06 16:06 UTCGHSA enrichment
  53. 2026-06-06 13:47 UTCEPSS rescore
  54. 2026-06-05 22:47 UTCEPSS rescore
  55. 2026-06-05 13:54 UTCEG score recompute
  56. 2026-06-05 13:54 UTCVendor advisory
  57. 2026-06-05 13:54 UTCGHSA enrichment
  58. 2026-06-05 06:10 UTCEPSS rescore
  59. 2026-06-04 13:12 UTCEPSS rescore
  60. 2026-06-04 11:42 UTCEG score recompute
  61. 2026-06-04 11:42 UTCVendor advisory
  62. 2026-06-04 11:42 UTCGHSA enrichment
  63. 2026-06-03 09:30 UTCEG score recompute
  64. 2026-06-03 09:30 UTCVendor advisory
  65. 2026-06-03 09:30 UTCGHSA enrichment
  66. 2026-06-02 20:13 UTCEPSS rescore
  67. 2026-06-02 07:15 UTCEG score recompute
  68. 2026-06-02 07:15 UTCVendor advisory
  69. 2026-06-02 07:15 UTCGHSA enrichment
  70. 2026-06-01 13:52 UTCEPSS rescore
  71. 2026-06-01 05:03 UTCEG score recompute▲ 6.50
  72. 2026-06-01 05:03 UTCVendor advisory
  73. 2026-06-01 05:03 UTCGHSA enrichment
  74. 2026-05-31 22:30 UTCEPSS rescore
  75. 2026-05-31 00:16 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-8961?
CVE-2026-8961 is a medium vulnerability published on May 19, 2026. Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
When was CVE-2026-8961 disclosed?
CVE-2026-8961 was first published in the National Vulnerability Database on May 19, 2026, with the most recent update on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8961 actively exploited?
CVE-2026-8961 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8961?
CVE-2026-8961 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-8961?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8961, 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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