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A privilege escalation vulnerability exists in the DOM: Networking component of Mozilla Firefox and Mozilla Thunderbird. The issue affects Firefox prior to 154, Firefox ESR prior to 115.39, 140.14, and 153.1 on the respective supported branches, and Thunderbird prior to 154, 140.14, and 153.1 on the respective supported branches. Specific vulnerable functions or root-cause details are not currently available, but the flaw is characterized by Mozilla as a privilege escalation issue within browser networking-related DOM handling.
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What an attacker gets, and what they’ve been doing with it.
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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 specific vulnerability affecting Debian 13 firefox-esr packages; no further technical details are provided in the content.
A specific vulnerability identified as CVE-2026-74935, referenced by a Tenable/Nessus plugin as unpatched and affecting Linux distributions and Mozilla-related packages such as Firefox, Thunderbird, and mozjs packages. The content does not describe the underlying flaw type.
Unknown; listed as one of multiple vulnerabilities addressed by Mozilla Thunderbird 140.14.
A vulnerability affecting Mozilla Thunderbird, referenced by a Tenable plugin for macOS Thunderbird 140.14.
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.