PT-2026-91956 · Mozilla+1 · Thunderbird+2

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CVE-2026-92020

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Published

2026-09-15

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Updated

2026-09-30

CVSS v3.1

8.8

High

VectorAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions Firefox versions prior to 156 Firefox ESR versions prior to 115.41 Firefox ESR versions prior to 140.16 Firefox ESR versions prior to 153.3 Thunderbird versions prior to 156 Thunderbird versions prior to 140.16 Thunderbird versions prior to 153.3
Description Privilege escalation is possible due to incorrect boundary conditions within the Graphics: WebRender component.
Recommendations Update Firefox to version 156. Update Firefox ESR to version 115.41. Update Firefox ESR to version 140.16. Update Firefox ESR to version 153.3. Update Thunderbird to version 156. Update Thunderbird to version 140.16. Update Thunderbird to version 153.3.

Fix

LPE

Buffer Overflow

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Weakness Enumeration

Related Identifiers

ALSA-2026:69461
ALSA-2026:69462
ALSA-2026:70642
ALSA-2026:71652
ALSA-2026:73130
ALSA-2026:73971
CVE-2026-92020
OESA-2026-4120
OESA-2026-4121
OESA-2026-4122
OESA-2026-4123
OPENSUSE-SU-2026:11796-1
OPENSUSE-SU-2026:11826-1
OPENSUSE-SU-2026:11827-1
OPENSUSE-SU-2026:21951-1
SUSE-SU-2026:23918-1
SUSE-SU-2026:4247-1
SUSE-SU-2026:4264-1

Affected Products

Firefox
Rocky Linux
Thunderbird