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CVE-2026-92020 is a high-severity privilege-escalation vulnerability caused by incorrect boundary conditions in Mozilla's Graphics: WebRender component. The flaw affects Firefox releases before 156, Firefox ESR releases before 115.41, 140.16, and 153.3 as applicable, and affected Thunderbird releases before 156 and Thunderbird ESR 140.16. Mozilla corrected the boundary-condition handling in the corresponding security updates.
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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.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability covered by the Mozilla Thunderbird 156.0 update; no individual technical details are provided.
A high-severity Mozilla Thunderbird vulnerability requiring user interaction that can compromise confidentiality, integrity, and availability. It was patched September 15, 2026.
A vulnerability referenced in the Mozilla Thunderbird 156.0 security advisory; no technical details are provided.
A high-impact Mozilla Thunderbird vulnerability fixed in the Thunderbird 140.16 update. The supplied CVSS vector indicates network attackability with low complexity and no privileges required, but user interaction is required; successful exploitation can fully affect confidentiality, integrity, and availability.
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.