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CVE-2026-54433

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团队开源的一款Web邮件客户端软件。 Roundcube webmail 1.6.17之前版本和1.7.2之前版本存在跨站脚本漏洞，该漏洞源于通过特制纯文本电子邮件消息存在存储型跨站脚本攻击，攻击者控制的JavaScript在受害者已认证会话中通过打开或预览消息执行。

CVSS 7.2 · High EPSS 0.31% · P22

Affected Version Matrix 2

VendorProduct Version RangeStatus
Roundcube Webmail 1.6.0< 1.6.17 affected
1.7.0< 1.7.2 affected
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I. Basic Information for CVE-2026-54433

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, there is Stored Cross-Site Scripting (XSS) via a crafted plain-text email message. The attacker-controlled JavaScript executes within the victim's authenticated session simply by opening or previewing the message (zero-click).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
Vulnerability Title
Roundcube webmail 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Roundcube webmail是Roundcube团队开源的一款Web邮件客户端软件。 Roundcube webmail 1.6.17之前版本和1.7.2之前版本存在跨站脚本漏洞，该漏洞源于通过特制纯文本电子邮件消息存在存储型跨站脚本攻击，攻击者控制的JavaScript在受害者已认证会话中通过打开或预览消息执行。
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 ~ 1.6.17 -

II. Public POCs for CVE-2026-54433

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III. Intelligence Information for CVE-2026-54433

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Vendor Advisories for CVE-2026-54433 (1)

Same Patch Batch · Roundcube · 2026-07-14 · 6 CVEs total

CVE-2026-62643 7.2 HIGH Roundcube webmail 服务端请求伪造漏洞
CVE-2026-62644 6.4 MEDIUM Roundcube webmail 授权问题漏洞
CVE-2026-54432 4.7 MEDIUM Roundcube webmail 跨站脚本漏洞
CVE-2026-62642 4.3 MEDIUM Roundcube webmail 资源管理错误漏洞
CVE-2026-62641 4.3 MEDIUM Roundcube webmail 资源管理错误漏洞

IV. Related Vulnerabilities

Same product: Webmail
Same vendor: Roundcube
Same weakness: CWE-79

V. Comments for CVE-2026-54433

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