CVE-2026-40539
HighCVSS 7.1Summary
An improper certificate validation vulnerability in Email API in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows man-in-the-middle attackers to read or write arbitrary files and conduct denial-of-service attacks.
Risk Assessment
A man-in-the-middle attacker can intercept or modify email communication, leading to data leakage, modification, or service unavailability.
Recommendation
Update Synology DSM to version 7.2.1-69057-10, 7.2.2-72806-7, 7.3.2-86009-2 or later, and consider enforcing proper certificate validation in the mail configuration.
Other vulnerabilities in Synology DiskStation Manager
See all- CVE-2026-6205High
An external control of file name or path vulnerability in Upload API in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows remote authenticated users to write arbitrary files and conduct denial-of-service attacks.
- CVE-2026-4036Medium
SQL injection vulnerability in the Sharing API in Synology DiskStation Manager (DSM) before versions 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2. A remote authenticated user can exploit this flaw to obtain arbitrary shared files.
- CVE-2026-40538Low
A vulnerability in the Auto block feature in Synology DiskStation Manager (DSM) before versions 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2 allows remote attackers to read limited files via brute-force attacks. The issue stems from improper restriction of excessive authentication attempts.
- CVE-2026-40537Medium
Server-Side Request Forgery (SSRF) vulnerability in the PersonMail API in Synology DiskStation Manager (DSM) before versions 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2. A remote authenticated user can exploit this flaw to obtain non-sensitive information.
- CVE-2026-40536Medium
Path traversal vulnerability in the Audio API in Synology DiskStation Manager (DSM) before versions 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2. A remote authenticated user can exploit this flaw to obtain non-sensitive information.
- CVE-2026-40535Medium
Path traversal vulnerability in the Desktop API in Synology DiskStation Manager (DSM) before versions 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2. A remote attacker can write limited files and conduct limited denial-of-service attacks.
- CVE-2026-40534Medium
Cross-site scripting (XSS) vulnerability in the Video API in Synology DiskStation Manager (DSM) before versions 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2. A remote authenticated user can read or write limited files when the player is launched.
- CVE-2026-40533Medium
Exposure of sensitive information through data queries vulnerability in the Desktop API in Synology DiskStation Manager (DSM) before versions 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2. A remote attacker can obtain non-sensitive information.
- CVE-2026-40532Medium
Forced browsing vulnerability in the Wallpaper Path in Synology DiskStation Manager (DSM) before versions 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2. A remote authenticated user can obtain sensitive information.
- CVE-2026-40531Medium
Integer overflow or wraparound vulnerability in File Operation in Synology DiskStation Manager (DSM) before versions 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2. A remote authenticated user can conduct limited denial-of-service attacks.
Original NVD description (English source)
An improper certificate validation vulnerability in Email API in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows man-in-the-middle attackers to read or write arbitrary files and conduct denial-of-service attacks.