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CVE-2026-40514— SmarterTools SmarterMail < Build 9610 Cryptographic Weakness via Weak RNG

Quick assessment

Affected
SmarterTools Inc. SmarterMail
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.

SmarterTools SmarterMail是SmarterTools公司的一套邮件服务器软件。该软件支持垃圾邮件过滤、数据统计、简单邮件传输协议SMTP验证等功能。 SmarterTools SmarterMail 9610之前版本存在安全特征问题漏洞，该漏洞源于文件和电子邮件共享端点使用DES-CBC加密时密钥和初始化向量派生自熵不足的System.Random，可能导致未经身份验证的攻击者伪造共享令牌访问任意电子邮件、附件或文件存储内容。

CVSS 5.9 · Medium EPSS 0.15% · P5

Affected Version Matrix 1

VendorProduct Version RangeStatus
SmarterTools Inc. SmarterMail < 100.0.9610 affected
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I. Basic Information for CVE-2026-40514

Vulnerability Information
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Vulnerability Title
SmarterTools SmarterMail < Build 9610 Cryptographic Weakness via Weak RNG
Source: CVE Program / CVE List V5
Vulnerability Description
SmarterTools SmarterMail builds prior to 9610 contain a cryptographic weakness in the file and email sharing endpoints that use DES-CBC encryption with keys and initialization vectors derived from System.Random seeded with insufficient entropy, reducing the seed space to approximately 19,000 possible values. An unauthenticated attacker can use the attachment download endpoint as an oracle to determine the seed in use and derive encryption keys and initialization vectors to forge sharing tokens for arbitrary emails, attachments, or file storage contents without prior access to the targeted content.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用具有密码学弱点缺陷的PRNG
Source: CVE Program / CVE List V5
Vulnerability Title
SmarterTools SmarterMail 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SmarterTools SmarterMail是SmarterTools公司的一套邮件服务器软件。该软件支持垃圾邮件过滤、数据统计、简单邮件传输协议SMTP验证等功能。 SmarterTools SmarterMail 9610之前版本存在安全特征问题漏洞，该漏洞源于文件和电子邮件共享端点使用DES-CBC加密时密钥和初始化向量派生自熵不足的System.Random，可能导致未经身份验证的攻击者伪造共享令牌访问任意电子邮件、附件或文件存储内容。
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
SmarterTools Inc. SmarterMail 0 ~ 100.0.9610 -

II. Public POCs for CVE-2026-40514

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III. Intelligence Information for CVE-2026-40514

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Vendor Advisories for CVE-2026-40514 (1)

Vendor Pages for CVE-2026-40514 (1)

IV. Related Vulnerabilities

Same product: SmarterMail
Same vendor: SmarterTools Inc.
Same weakness: CWE-338

V. Comments for CVE-2026-40514

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