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CVE-2026-84128 is a privilege-escalation vulnerability in the WebDriver BiDi component used by Mozilla Firefox and Thunderbird. Mozilla corrected the flaw in Firefox 155 and Thunderbird 155. Technical details regarding the underlying vulnerable function, attack sequence, and privilege boundary crossed are not currently available.
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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.
A vulnerability addressed by the Fedora 44 Thunderbird update.
A vulnerability addressed by the Fedora 45 Thunderbird security update; the vulnerability type is not specified.
A vulnerability addressed by the Fedora advisory; no technical flaw details are provided.
A vulnerability addressed by the referenced Fedora Firefox/NSS advisory; no flaw-specific description is supplied.
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.