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CVE-2026-12296 is a sandbox escape vulnerability in Mozilla's Security: Process Sandboxing component affecting Firefox and Thunderbird. The available advisory text identifies the issue only at a high level as a flaw in the browser process sandboxing mechanism; no vulnerable function, code path, or root-cause details are provided in the supplied content. Mozilla states the issue was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12. The broader advisory context indicates this flaw is one of several sandbox escape issues that could be triggered in conjunction with specially crafted web content and potentially chained with a separate browser memory-corruption vulnerability to move from code execution inside a sandboxed browser process to compromise of the underlying system.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.