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How the mentioned CVE works:
CVE-2025-14331 is a security flaw in the Request Handling component of Mozilla products that allows a malicious website to bypass the same-origin policy (SOP). The vulnerability stems from improper validation or handling of origin headers during cross-origin requests. An attacker can craft a web page containing JavaScript that makes a forged request to a target site, such as an internal web service. By manipulating request parameters like the `Origin` or `Referer` headers, the malicious script can trick the browser into treating the response as same-origin. This allows the attacker’s script to read sensitive data from the cross-origin response, which should normally be blocked. The flaw specifically affects how the browser processes responses for certain types of network requests, failing to correctly enforce SOP rules. Exploitation typically involves luring a user to a malicious site, which then silently initiates requests to other sites where the user is authenticated.
DailyCVE Form:
Platform: Mozilla Firefox
Version: < 146
Vulnerability: SOP Bypass
Severity: Critical
Date: 2025-12-09
Prediction: 2025-12-18
What Undercode Say:
Analytics:
curl -H "Origin: https://attacker.com" https://victim-site.com/api/data
fetch('https://internal-service.local/data', {
mode: 'no-cors',
headers: { 'Origin': 'https://trusted-domain.com' }
})
.then(response => response.text())
.then(data => exfiltrate(data));
How Exploit:
An attacker hosts a malicious webpage. The page uses JavaScript to send a crafted HTTP request to a vulnerable internal or cross-origin endpoint. By setting a deceptive `Origin` header, the browser mishandles the response, allowing the attacker’s script to access restricted data. The stolen data is then sent to the attacker’s server.
Protection from this CVE:
Update Firefox immediately.
Disable JavaScript globally.
Use strict Content Security Policy.
Impact:
Cross-site data theft.
Session hijacking potential.
Internal network exposure.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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