CVE-2021-29960: Mozilla Firefox

Medium severity, CVSS 4.3. EPSS: 0.8% chance of exploitation in the next 30 days.

Firefox used to cache the last filename used for printing a file. When generating a filename for printing, Firefox usually suggests the web page title. The caching and suggestion techniques combined may have lead to the title of a website visited during private browsing mode being stored on disk. This vulnerability affects Firefox < 89.

Affected products

• Mozilla Firefox: from 78.11.0, before 89.0 (fixed in 89.0)

Published 2021-06-24. Last modified 2026-06-17.