[UPDATE] [hoch] Mozilla Firefox und Thunderbird: Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in Mozilla Firefox und Mozilla Thunderbird ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, Berechtigungen zu erweitern, Sandbox-Escapes durchzuführen, Daten zu manipulieren, einen Denial-of-Service-Zustand auszulösen oder Speicherbeschädigungen zu verursachen.
CSIRTS triage
- What
- An attacker can exploit multiple vulnerabilities in Mozilla Firefox and Firefox ESR to execute arbitrary code, bypass security measures, disclose confidential information, escalate permissions, perform sandbox escapes, manipulate data, trigger a denial-of-service condition, or cause memory corruption.
- Who is affected
- Users of Mozilla Firefox and Firefox ESR are affected.
- Urgency
- Remediation is high urgency due to the potential for severe exploitation and active attacks.
- Action
- Update to the latest version of Firefox or Firefox ESR to address the vulnerabilities.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch Firefox and Firefox ESR
Get an email when a new Firefox and Firefox ESR advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2458
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-157180.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-157190.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-163490.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-163500.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-163510.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-163520.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-163530.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-163540.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-163550.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-163560.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.
Referenced CVEs
+12 more CVEs referenced in this advisory.
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[UPDATE] [hoch] Mozilla Firefox und Thunderbird: Mehrere Schwachstellencert-bund
- unknownDSA-6483-1 thunderbird - security updatedebian
- unknownMozilla Products Multiple Vulnerabilitieshkcert
- unknownDSA-6481-1 firefox-esr - security updatedebian
- unknownMultiples vulnérabilités dans les produits Mozilla (02 septembre 2026)cert-fr-avis
- medium[NEW] [medium] Mozilla Firefox: Multiple vulnerabilities allow unspecified attackcert-bund
- unknownDSA-6418-1 thunderbird - security updatedebian
- unknownDSA-6403-1 nss - security updatedebian
- unknownMultiple vulnerabilities in Mozilla Thunderbird (July 23, 2026)cert-fr-avis
- unknownMozilla Products Multiple Vulnerabilitieshkcert
- unknownDSA-6394-1 firefox-esr - security updatedebian
- unknownMultiple vulnerabilities in Mozilla products (July 22, 2026)cert-fr-avis
Recent advisories for Mozilla Firefox und Thunderbird
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[UPDATE] [hoch] Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellencert-bund · 2026-09-10
- high[UPDATE] [hoch] Mozilla Firefox und Thunderbird: Mehrere Schwachstellencert-bund · 2026-09-07
More from CERT-Bund (BSI) Security Advisories
- medium[UPDATE] [mittel] vim: Mehrere Schwachstellen2026-09-10
- medium[UPDATE] [mittel] ffmpeg: Mehrere Schwachstellen ermöglichen Codeausführung und DoS2026-09-10
- high[UPDATE] [hoch] ffmpeg: Mehrere Schwachstellen2026-09-10
- medium[UPDATE] [mittel] Unbound: Mehrere Schwachstellen2026-09-10
- high[UPDATE] [hoch] Internet Systems Consortium BIND: Mehrere Schwachstellen2026-09-10