CVE-2026-109715
highpriority · track · 10EPSS 0.003 · 24 %ileexploit · PoCDEFREPSS · scored 2026-10-27
Incorrect boundary conditions in the JavaScript Engine component. This vulnerability was fixed in Firefox 158, Firefox ESR 115.43, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
exploits (1)
Public proof-of-concept and weaponised exploit code.
affected products (10)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-3942Mozilla Firefox und Thunderbrid: Mehrere SchwachstellenDeutsch2026-10-13csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox und Mozilla Thunderbrid ausnutzen, um seine Privilegien zu erhöhen, Sicherheitsmaßnahmen zu umgehen, Spoofing-Angriffe durchzuführen, Daten offenzulegen oder zu manipulieren, Denial-of-Service-Zustände zu verursachen oder andere, nicht näher spezifizierte Angriffe durchzuführen.
- CERTFR-2026-AVI-1305Multiples vulnérabilités dans les produits MozillaFrançais2026-10-14vendor · certfrFR
sources
Which sources assert this record, and when.
references (6) nvd
External citations — patches, advisories, analysis.
- https://bugzilla.mozilla.org/show_bug.cgi?id=2073267
- https://www.mozilla.org/security/advisories/mfsa2026-106/
- https://www.mozilla.org/security/advisories/mfsa2026-107/
- https://www.mozilla.org/security/advisories/mfsa2026-108/
- https://www.mozilla.org/security/advisories/mfsa2026-109/
- https://www.mozilla.org/security/advisories/mfsa2026-110/
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