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CVE-2026-75874 is a high-impact sandbox escape vulnerability in Mozilla's Remote Settings Client component. Successful exploitation can break out of browser sandbox restrictions and weaken the isolation boundary intended to constrain untrusted web content. Mozilla fixed the issue in Firefox 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 154, Thunderbird ESR 140.15, and Thunderbird ESR 153.2.
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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.
31 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by Slackware Security Advisory SSA_2026-247-02; no technical flaw description is provided.
A vulnerability addressed by the Slackware Mozilla Thunderbird security update; no technical flaw details are provided.
A vulnerability referenced by the Debian 13.0 Thunderbird localization-package advisory; no technical flaw details are provided.
A vulnerability addressed by Mozilla Firefox ESR 115.40. The plugin assigns it a CVSS v3.0 score/vector of 10.0 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).
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.