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CVE-2026-100760 is a sandbox-escape vulnerability in the Security: Process Sandboxing component affecting Mozilla Firefox, Firefox ESR, and Thunderbird. Successful exploitation can bypass process-sandbox restrictions and undermine isolation. The underlying implementation flaw, vulnerable function, and exploit trigger are not specified. The vulnerability was fixed in Firefox 157, Firefox ESR 153.4, Thunderbird 157, and Thunderbird 153.4.
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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.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown
A critical, remotely exploitable vulnerability (CVSS v3 9.8) identified as CVE-2026-100760. The notice associates it with Debian Linux 12.0, 13.0, and 14.0, including Firefox ESR, but does not state the specific vulnerable component or technical flaw.
Referenced as affecting Mozilla Thunderbird versions earlier than 153.4; the specific flaw is not described.
An unspecified vulnerability addressed by upgrading Mozilla Thunderbird to version 153.4 or later.
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.