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CVE-2026-12304 is a same-origin policy bypass vulnerability in Mozilla's Networking: Cookies component affecting Firefox and Thunderbird. The provided content identifies the flaw as a bypass of browser same-origin restrictions related to cookie handling. While the specific vulnerable function or code path is not provided, the issue allows origin isolation guarantees enforced by the browser to be bypassed through the cookie subsystem. Mozilla states the vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
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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.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A same-origin policy bypass vulnerability affecting cookie handling in Firefox.
A Firefox same-origin policy bypass vulnerability in the Networking: Cookies component that could allow bypass of security restrictions.
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.