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CVE-2026-84131 is a moderate-severity privilege-escalation vulnerability caused by invalid pointer handling in Mozilla's Graphics component. It affects Firefox versions before 155, Firefox ESR versions before 115.40, 140.15, and 153.2 on their respective release branches, and Thunderbird versions before 155, 140.15, and 153.2 on their respective branches. The available information does not identify the affected function, pointer provenance, or exploitation sequence.
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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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced by the Mozilla Firefox ESR 115.40 plugin; no technical vulnerability details are provided.
A vulnerability addressed by the Mozilla Firefox ESR 140.15 update; no technical vulnerability details are provided.
A vulnerability affecting Mozilla Firefox ESR addressed by the referenced Firefox ESR update; the content provides no technical flaw description.
A vulnerability addressed by the referenced Mozilla Firefox ESR security update. No technical flaw details are provided.
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.