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CVE-2026-74998

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团队开源的一款Web邮件客户端软件。 Roundcube Webmail 1.6.18之前版本和1.7.3之前的1.7.x版本存在跨站脚本漏洞，该漏洞源于CSS代理响应未经验证，可能导致信息泄露或通过MIME嗅探导致跨站脚本。

CVSS 7.2 · High EPSS 0.27% · P19

Possible ATT&CK Techniques 2 AI

T1562.006 T1059.007 · JavaScript

Affected Version Matrix 2

VendorProduct Version RangeStatus
Roundcube Webmail 1.6.0< 1.6.18 affected
1.7.0< 1.7.3 affected
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I. Basic Information for CVE-2026-74998

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.
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 1.6.18之前版本和1.7.3之前的1.7.x版本存在跨站脚本漏洞，该漏洞源于CSS代理响应未经验证，可能导致信息泄露或通过MIME嗅探导致跨站脚本。
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 ~ 1.6.18 -

II. Public POCs for CVE-2026-74998

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7455 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-74998

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Patches & Fixes for CVE-2026-74998 (2)

Vendor Advisories for CVE-2026-74998 (1)

Vendor Pages for CVE-2026-74998 (1)

Same Patch Batch · Roundcube · 2026-08-17 · 10 CVEs total

CVE-2026-74997 8.8 HIGH Roundcube Webmail 命令注入漏洞
CVE-2026-75002 7.1 HIGH Roundcube Webmail 命令注入漏洞
CVE-2026-75010 6.4 MEDIUM Roundcube Webmail 权限许可和访问控制问题漏洞
CVE-2026-75000 5.8 MEDIUM Roundcube Webmail 权限许可和访问控制问题漏洞
CVE-2026-75003 5.8 MEDIUM Roundcube Webmail 权限许可和访问控制问题漏洞
CVE-2026-75006 5.8 MEDIUM Roundcube Webmail 服务端请求伪造漏洞
CVE-2026-74999 5.4 MEDIUM Roundcube Webmail 跨站脚本漏洞
CVE-2026-75007 5.4 MEDIUM Roundcube Webmail 命令注入漏洞
CVE-2026-75004 4.3 MEDIUM Roundcube Webmail 命令注入漏洞

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-74998

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