CVE-2026-40514 — SmarterTools SmarterMail builds prior to 9610 contain a

title: SmarterMail DES-CBC Weak Seed Exploitation Attempt — CVE-2026-40514
id: scw-2026-04-27-ai-1
status: experimental
level: critical
description: |
  Detects attempts to exploit CVE-2026-40514 by accessing the attachment download endpoint with specific parameters. This vulnerability allows an unauthenticated attacker to forge sharing tokens by exploiting a weak cryptographic implementation in SmarterMail builds prior to 9610, enabling access to arbitrary emails or attachments.
author: SCW Feed Engine (AI-generated)
date: 2026-04-27
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-40514/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/downloadattachment.ashx'
      cs-uri-query|contains:
          - 'emailid='
          - 'attachmentid='
      condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse