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CVE-2026-100830 is a mitigation-bypass vulnerability in the DOM: Navigation component used by Mozilla Firefox, Firefox ESR, and Thunderbird. Exploitation may bypass security mitigations associated with DOM navigation. The specific mitigation, vulnerable function, and underlying implementation defect are not identified. 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 affecting Debian Linux 12.0, 13.0, and 14.0, including the Firefox ESR package context indicated by the CPE data. The supplied CVSS v3 vector indicates network reachability, low attack complexity, no privileges or user interaction required, and high confidentiality, integrity, and availability impact.
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.