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CVE-2026-35540

Quick assessment

Affected
Roundcube Webmail
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 1.6.0至1.6.14之前版本存在安全漏洞，该漏洞源于HTML电子邮件中CSS清理不足，可能导致服务端请求伪造或信息泄露。

CVSS 5.4 · Medium EPSS 0.39% · P31
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I. Basic Information for CVE-2026-35540

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in Roundcube Webmail 1.6.0 before 1.6.14. Insufficient Cascading Style Sheets (CSS) sanitization in HTML e-mail messages may lead to SSRF or Information Disclosure, e.g., if stylesheet links point to local network hosts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在范围间的资源转移不正确
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 1.6.0至1.6.14之前版本存在安全漏洞，该漏洞源于HTML电子邮件中CSS清理不足，可能导致服务端请求伪造或信息泄露。
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 1.6.0 ~ 1.6.14 -

II. Public POCs for CVE-2026-35540

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III. Intelligence Information for CVE-2026-35540

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Patches & Fixes for CVE-2026-35540 (2)

Vendor Advisories for CVE-2026-35540 (1)

Vendor Pages for CVE-2026-35540 (2)

Same Patch Batch · Roundcube · 2026-04-03 · 9 CVEs total

CVE-2026-35539 6.1 MEDIUM Roundcube Webmail 跨站脚本漏洞
CVE-2026-35543 5.3 MEDIUM Roundcube Webmail 安全漏洞
CVE-2026-35545 5.3 MEDIUM Roundcube Webmail 安全漏洞
CVE-2026-35544 5.3 MEDIUM Roundcube Webmail 安全漏洞
CVE-2026-35542 5.3 MEDIUM Roundcube Webmail 安全漏洞
CVE-2026-35541 4.2 MEDIUM Roundcube Webmail 安全漏洞
CVE-2026-35537 3.7 LOW Roundcube Webmail 代码问题漏洞
CVE-2026-35538 3.1 LOW Roundcube Webmail 参数注入漏洞

IV. Related Vulnerabilities

Same product: Webmail
Same vendor: Roundcube
Same weakness: CWE-669

V. Comments for CVE-2026-35540

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