{"id":"ALSA-2021:4123","summary":"Important: firefox security update","details":"Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.\n\nThis update upgrades Firefox to version 91.3.0 ESR.\n\nSecurity Fix(es):\n\n* Mozilla: Use-after-free in HTTP2 Session object\n\n* Mozilla: Memory safety bugs fixed in Firefox 94 and Firefox ESR 91.3\n\n* Mozilla: iframe sandbox rules did not apply to XSLT stylesheets (CVE-2021-38503)\n\n* Mozilla: Use-after-free in file picker dialog (CVE-2021-38504)\n\n* Mozilla: Firefox could be coaxed into going into fullscreen mode without notification or warning (CVE-2021-38506)\n\n* Mozilla: Opportunistic Encryption in HTTP2 could be used to bypass the Same-Origin-Policy on services hosted on other ports (CVE-2021-38507)\n\n* Mozilla: Permission Prompt could be overlaid, resulting in user confusion and potential spoofing (CVE-2021-38508)\n\n* Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain (CVE-2021-38509)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","modified":"2026-02-04T04:22:52.523686Z","published":"2021-11-03T19:23:08Z","related":["CVE-2021-38503","CVE-2021-38504","CVE-2021-38506","CVE-2021-38507","CVE-2021-38508","CVE-2021-38509"],"references":[{"type":"REPORT","url":"https://vulners.com/cve/CVE-2021-38503"},{"type":"REPORT","url":"https://vulners.com/cve/CVE-2021-38504"},{"type":"REPORT","url":"https://vulners.com/cve/CVE-2021-38506"},{"type":"REPORT","url":"https://vulners.com/cve/CVE-2021-38507"},{"type":"REPORT","url":"https://vulners.com/cve/CVE-2021-38508"},{"type":"REPORT","url":"https://vulners.com/cve/CVE-2021-38509"}],"affected":[{"package":{"name":"firefox","ecosystem":"AlmaLinux:8","purl":"pkg:rpm/almalinux/firefox"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.3.0-1.el8_4.alma"}]}],"database_specific":{"source":"https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux8/ALSA-2021:4123.json"}}],"schema_version":"1.7.3"}