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CVE-2026-74942 is a privilege escalation vulnerability in Mozilla's Remote Settings Client component affecting Firefox and Thunderbird. The issue allows an attacker to elevate privileges through the Remote Settings Client under affected versions. Publicly available information in the provided material does not include the specific vulnerable function, root cause details, or a precise exploitation path.
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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.
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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.
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 tracked as CVE-2026-74942 affecting Linux distributions and related Firefox/Thunderbird/mozjs packages, referenced here as unpatched.
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.