Mozilla Firefox iOS: Mehrere Schwachstellen ermöglichen Manipulation von Dateien und die Offenlegung von Informationen
WID-SEC-2026-1961 · first 17.06.2026 · updated 17.06.2026 · CVSS 5,4
What it is about
Firefox ist ein Open Source Web Browser. Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Mozilla Firefox ausnutzen, um Dateien zu manipulieren und vertrauliche Informationen offenzulegen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- Dateien zu manipulieren
- vertrauliche Informationen offenzulegen
Am I affected?
Affected according to the BSI:
- Mozilla Firefox iOS <152.0
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Mozilla Firefox iOS 152.0
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
CVE: CVE-2026-53899, CVE-2026-53900
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.