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CVE-2026-100800 is a use-after-free vulnerability in the Disability Access APIs component of Mozilla Firefox and Firefox ESR that can enable escape from the browser sandbox. The vulnerability is fixed in Firefox 157 and Firefox ESR 153.4; the affected-product information also identifies fixes in Thunderbird 157 and Thunderbird 153.4.
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What an attacker gets, and what they’ve been doing with it.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An unpatched, network-accessible vulnerability with low attack complexity and no required privileges, requiring user interaction and rated as having high confidentiality, integrity, and availability impact. The content does not identify the underlying flaw type or affected component beyond the listed Debian/Linux and Firefox ESR CPE entries.
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.
A use-after-free vulnerability in Firefox's Disability Access APIs component that could allow a sandbox escape.
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.