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CVE-2025-14331 is a same-origin policy bypass vulnerability in the Request Handling component of Mozilla Firefox and Mozilla Thunderbird. The flaw allows web content or other processed content to circumvent origin-based security restrictions enforced by the browser or mail client. Same-origin policy bypasses can permit an attacker-controlled origin to access or interact with data that should remain isolated to a different origin, undermining a core browser security boundary. The issue was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
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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 same-origin policy bypass vulnerability in the Request Handling component of Mozilla products, potentially allowing attackers to access restricted resources.
A same-origin policy bypass vulnerability in the Request Handling component of Firefox ESR, which could allow attackers to access data across different origins.
A same-origin policy bypass vulnerability in the Request Handling component of Firefox, which could allow attackers to access data across different origins, violating browser security boundaries.
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.