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CVE-2026-8959

🗓️ 19 May 2026 12:29:55Reported by mozillaType 
cve
 cve
🔗 web.nvd.nist.gov👁 11 Views

Sandbox escape due to incorrect Widget Win32 boundary; fixed in Firefox 151 and ESR 140.11.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-8959
19 May 202612:29
attackerkb
Tenable Nessus
AlmaLinux 9 : thunderbird (ALSA-2026:21381)
29 May 202600:00
nessus
Tenable Nessus
AlmaLinux 10 : thunderbird (ALSA-2026:22325)
3 Jun 202600:00
nessus
Tenable Nessus
AlmaLinux 8 : thunderbird (ALSA-2026:22643)
3 Jun 202600:00
nessus
Tenable Nessus
Fedora 42 : firefox / nss (2026-7f6ee801e2)
25 May 202600:00
nessus
Tenable Nessus
Fedora 43 : firefox / nss (2026-cd20332935)
20 May 202600:00
nessus
Tenable Nessus
Fedora 44 : firefox (2026-f3409cf313)
20 May 202600:00
nessus
Tenable Nessus
Mozilla Firefox ESR < 140.11
19 May 202600:00
nessus
Tenable Nessus
Mozilla Firefox < 151.0
19 May 202600:00
nessus
Tenable Nessus
Mozilla Thunderbird < 140.11
19 May 202600:00
nessus
Rows per page
NVD
Node
mozillafirefoxRange<140.11.0esr
OR
mozillafirefoxRange<151.0.0-
OR
mozillathunderbirdRange<140.11esr
OR
mozillathunderbirdRange<151.0.0
[
  {
    "product": "Firefox",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "140.11",
        "lessThanOrEqual": "140.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "151",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  },
  {
    "product": "Thunderbird",
    "vendor": "Mozilla",
    "versions": [
      {
        "status": "unaffected",
        "version": "140.11",
        "lessThanOrEqual": "140.*",
        "versionType": "rpm"
      },
      {
        "status": "unaffected",
        "version": "151",
        "lessThanOrEqual": "*",
        "versionType": "rpm"
      }
    ]
  }
]

Data

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20 May 2026 14:28Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.19.6
EPSS0.00164
SSVC
11