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CVE-2026-25916

Quick assessment

Affected
Roundcube Webmail
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Roundcube Webmail是Roundcube开源的一款基于浏览器的开源IMAP客户端，它支持地址薄管理、信息搜索、拼写检查等。 Roundcube Webmail 1.5.13之前版本和1.6版本至1.6.13之前版本存在安全漏洞，该漏洞源于使用阻止远程图像功能时未阻止SVG feImage。

CVSS 4.3 · Medium EPSS 0.76% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-25916

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Roundcube Webmail before 1.5.13 and 1.6 before 1.6.13, when "Block remote images" is used, does not block SVG feImage.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未保护的候选通道
Source: CVE Program / CVE List V5
Vulnerability Title
Roundcube Webmail 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Roundcube Webmail是Roundcube开源的一款基于浏览器的开源IMAP客户端，它支持地址薄管理、信息搜索、拼写检查等。 Roundcube Webmail 1.5.13之前版本和1.6版本至1.6.13之前版本存在安全漏洞，该漏洞源于使用阻止远程图像功能时未阻止SVG feImage。
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

Vendor Product Affected Versions CPE Subscribe
Roundcube Webmail 0 ~ 1.5.13 -

II. Public POCs for CVE-2026-25916

# POC Description Source Link Shenlong Link
1 None https://github.com/mbanyamer/CVE-2026-25916-Roundcube-Webmail-DOM-based-XSS-Exploit-via-SVG-href-Attribute POC Details
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III. Intelligence Information for CVE-2026-25916

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Security Blog Posts for CVE-2026-25916 (1)

IV. Related Vulnerabilities

Same product: Webmail
Same vendor: Roundcube
Same weakness: CWE-420