CVE-2026-8954 :: Enginsight Vulnerability Database

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Affected Products (NVD)

Vendor	Product	Version
mozilla	firefox_esr	𝑥 < 140.11.0
mozilla	firefox	𝑥 < 151.0.0
mozilla	thunderbird_esr	𝑥 < 140.11

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

firefox

sid	151.0-1 fixed

firefox-esr

bookworm	vulnerable
bookworm (security)	vulnerable
bullseye	vulnerable
bullseye (security)	vulnerable
forky	vulnerable
sid	140.11.0esr-1 fixed
trixie	vulnerable
trixie (security)	vulnerable

thunderbird

bookworm	vulnerable
bookworm (security)	vulnerable
bullseye	vulnerable
bullseye (security)	vulnerable
forky	vulnerable
sid	vulnerable
trixie	vulnerable
trixie (security)	vulnerable

Common Weakness Enumeration

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.

Vulnerability Media Exposure

[GERMAN] Mozilla Firefox und Thunderbird: Mehrere Schwachstellen
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Mozilla Firefox, Mozilla Firefox ESR und Mozilla Thunderbird ausnutzen, um beliebigen Code auszuführen, um Informationen offenzulegen, Sicherheitsbeschränkungen zu umgehen (z. B. Sandbox-Escape), den Benutzer zu täuschen, Berechtigungen zu eskalieren oder einen Denial-of-Service-Zustand herbeizuführen.
Published: 2026-05-19T22:00:00+00:00

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2030747

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

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

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

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