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CVE-2026-100819 is a sandbox-escape vulnerability in Mozilla Firefox's XPCOM component caused by incorrect boundary conditions. The flaw can allow code executing within the browser sandbox to escape its intended restrictions.
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No public exploit code observed for this vulnerability.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability tracked as CVE-2026-100819, identified by a Nessus unpatched-vulnerability plugin as relevant to Debian Linux 12.0, 13.0, and 14.0, including Firefox ESR package context. The supplied CVSS v3 vector indicates network reachability, low attack complexity, no privileges required, user interaction required, changed scope, and high confidentiality, integrity, and availability impact.
A sandbox-escape vulnerability caused by incorrect boundary conditions in Mozilla Firefox's XPCOM component.
A Mozilla Firefox XPCOM boundary-condition flaw that permits sandbox escape. It has a CVSS v3.1 vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H, indicating high confidentiality, integrity, and availability impact after user interaction.
A vulnerability addressed by a Slackware Mozilla Firefox package update; no technical vulnerability details are provided.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.