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I. Basic Information for CVE-2025-6427
Vulnerability Information

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Vulnerability Title
connect-src Content Security Policy restriction could be bypassed
Source: NVD (National Vulnerability Database)
Vulnerability Description
An attacker was able to bypass the `connect-src` directive of a Content Security Policy by manipulating subdocuments. This would have also hidden the connections from the Network tab in Devtools. This vulnerability was fixed in Firefox 140 and Thunderbird 140.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mozilla Firefox 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Firefox 140之前版本存在安全漏洞,该漏洞源于connect-src指令可被绕过,可能导致隐藏网络连接。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
MozillaFirefox 140 ~ * -
MozillaThunderbird 140 ~ * -
II. Public POCs for CVE-2025-6427
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III. Intelligence Information for CVE-2025-6427
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IV. Related Vulnerabilities
V. Comments for CVE-2025-6427

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