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CVE-2026-100808 is a mitigation-bypass vulnerability in the DOM: Service Workers component of Mozilla Firefox. The flaw can allow security mitigations to be bypassed through the affected Service Workers functionality. Fixes are available in Firefox 157 and Firefox ESR 153.4; the vulnerability is also listed as fixed in Thunderbird 153.4 and Thunderbird 157.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-exploitable, high-severity vulnerability tracked as CVE-2026-100808. The supplied CVSS v3 vector indicates no privileges or user interaction are required and that successful exploitation could result in high confidentiality, integrity, and availability impact. The content does not identify the underlying flaw type.
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 mitigation-bypass vulnerability in Firefox's DOM: Service Workers component.
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.