CVE-2026-92021 :: Enginsight Vulnerability Database

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
mozilla	CNA	8.8 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: 20.79%

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).

Vendor	Product	Version	Source
mozilla	firefox	𝑥 < 140.16.0	CNA
mozilla	firefox_esr	116.0.0 ≤ 𝑥 < 140.16.0	CNA
mozilla	thunderbird	𝑥 < 140.16.0	CNA
mozilla	thunderbird_esr	𝑥 < 140.16.0	CNA

Debian Releases

Debian Product

Codename

firefox-esr

bookworm	vulnerable
bookworm (security)	153.5.1esr-1~deb12u1 fixed
forky	153.5.0esr-1 fixed
sid	153.5.1esr-1 fixed
trixie	vulnerable
trixie (security)	153.5.1esr-1~deb13u1 fixed

thunderbird

bookworm	vulnerable
bookworm (security)	1:140.17.0esr-1~deb12u1 fixed
forky	1:153.5.0esr-1 fixed
sid	1:153.5.1esr-1 fixed
trixie	vulnerable
trixie (security)	1:140.17.0esr-1~deb13u1 fixed

Ubuntu Releases

Ubuntu Product

Codename

firefox

jammy	not-affected
noble	not-affected
resolute	not-affected

thunderbird

jammy	needed
noble	not-affected
resolute	not-affected

mozjs38

bionic	needs-triage
jammy	dne
noble	dne
resolute	dne

mozjs52

bionic	ignored
focal	ignored
jammy	dne
noble	dne
resolute	dne

mozjs68

focal	ignored
jammy	dne
noble	dne
resolute	dne

mozjs78

jammy	ignored
noble	dne
resolute	dne

mozjs91

jammy	ignored
noble	dne
resolute	dne

mozjs102

jammy	ignored
noble	ignored
resolute	dne

mozjs115

jammy	dne
noble	ignored
resolute	dne

Red Hat Enterprise Linux Releases

Red Hat Product

Release

firefox

RHEL 9

0:140.16.0-1.el9_8

fixed

firefox-x11

RHEL 9

0:140.16.0-1.el9_8

fixed

thunderbird

RHEL 9

0:140.16.0-1.el9_8

fixed

Amazon Linux Releases

Amazon Package

Release

firefox

Amazon Linux 2023

0:140.17.0-1.amzn2023.0.1

fixed

firefox-debuginfo

Amazon Linux 2023

0:140.17.0-1.amzn2023.0.1

fixed

firefox-debugsource

Amazon Linux 2023

0:140.17.0-1.amzn2023.0.1

fixed

thunderbird

Amazon Linux 2

0:140.16.0-1.amzn2.0.1

fixed

Common Weakness Enumeration

CWE-416 - Use After Free
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

Vulnerability Media Exposure

[GERMAN] Mozilla Firefox und Thunderbird: Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox, Firefox ESR und Thunderbird ausnutzen, um seine Privilegien zu erhöhen, Sicherheitsmaßnahmen zu umgehen, Daten offenzulegen oder zu manipulieren, den Speicher zu beschädigen, Denial-of-Service-Zustände zu verursachen oder andere, nicht näher spezifizierte Angriffe durchzuführen.
Published: 2026-09-15T22:00:00+00:00

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2067208

https://www.mozilla.org/security/advisories/mfsa2026-92/

https://www.mozilla.org/security/advisories/mfsa2026-95/