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CVE-2026-35537

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 1.5.14之前版本和1.6.14之前版本存在代码问题漏洞，该漏洞源于不安全的反序列化，可能导致任意文件写入。

CVSS 3.7 · Low EPSS 0.60% · P47
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I. Basic Information for CVE-2026-35537

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Roundcube Webmail 代码问题漏洞
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 1.5.14之前版本和1.6.14之前版本存在代码问题漏洞，该漏洞源于不安全的反序列化，可能导致任意文件写入。
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 ~ 1.5.14 -

II. Public POCs for CVE-2026-35537

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 5322 chars
GitHub 复现环境（可 clone 直接跑）
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-2026-35537

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Patches & Fixes for CVE-2026-35537 (3)

Vendor Advisories for CVE-2026-35537 (1)

Vendor Pages for CVE-2026-35537 (3)

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-2026-35540 5.4 MEDIUM Roundcube Webmail 安全漏洞
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-2026-35538 3.1 LOW Roundcube Webmail 参数注入漏洞

IV. Related Vulnerabilities

Same product: Webmail
Same vendor: Roundcube
Same weakness: CWE-502

V. Comments for CVE-2026-35537

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