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I. Basic Information for CVE-2025-66514
Vulnerability Information

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Vulnerability Title
Nextcloud Mail stored HTML injection in subject text
Source: NVD (National Vulnerability Database)
Vulnerability Description
Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. Prior to 5.5.3, a stored HTML injection in the Mail app's message list allowed an authenticated user to inject HTML into the email subjects. Javascript was correctly blocked by the content security policy of the Nextcloud Server code.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Nextcloud Mail 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud Mail是德国Nextcloud公司的一个电子邮件。 Nextcloud Mail 5.5.3之前版本存在跨站脚本漏洞,该漏洞源于邮件列表中存在存储型HTML注入,可能导致HTML注入攻击。
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
nextcloudsecurity-advisories >= 5.2.0-beta.1, < 5.5.3 -
II. Public POCs for CVE-2025-66514
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III. Intelligence Information for CVE-2025-66514
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IV. Related Vulnerabilities
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