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Fencer Vulns
high 8.8

CVE-2026-92065 json

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component

published 2026-09-15 54 d ago modified 2026-10-05 34 d ago also EUVD-2026-78528

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 0%
public exploits
0
none known

Summary

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

Patch / fix

  • mozilla firefox 153.3.0, 156.0.0
  • mozilla thunderbird 153.3.0, 156.0
  • MozillaThunderbird SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 153.4.0-150400.13.6.1
  • MozillaFirefox SLES for SAP applications 16.0, SLES 16.0 153.3.0-160000.1.1
  • MozillaFirefox SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 153.3.0-150400.157.8.1
  • MozillaFirefox SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 153.3.0-118.8.1

suse advisories SUSE-SU-2026:4627-1SUSE-SU-2026:23918-1SUSE-SU-2026:4264-1SUSE-SU-2026:4247-1

  • MozillaThunderbird openSUSE Tumbleweed 153.4.0-1.1
  • MozillaFirefox openSUSE Leap 16.0 153.3.0-160000.1.1
  • MozillaFirefox openSUSE Tumbleweed 156.0-1.1
  • firefox-esr openSUSE Tumbleweed 153.3.0-1.1

opensuse advisories openSUSE-SU-2026:12098-1openSUSE-SU-2026:21951-1openSUSE-SU-2026:11826-1openSUSE-SU-2026:11796-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-92065 updated cvss 3.4

firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component

  • Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 firefox, thunderbird Red Hat Enterprise Linux 8 firefox, thunderbird Red Hat Enterprise Linux 9 firefox, firefox-x11, thunderbird Red Hat Enterprise Linux 10 firefox, thunderbird, rhel10/firefox-flatpak, rhel10/thunderbird-flatpak
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
48 d ago

Exploit prediction

0.10% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Mozilla Firefox
  • Mozilla Thunderbird

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.