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    CVE-2026-40539

    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.

    Published:Sep 18, 2026
    Last Modified:Sep 19, 2026
    EPS:Sep 18, 2026
    EPSS Score:0.00076
    CVSS Score:7.1

    Affected Products

    Vendor
    Synology
    Product
    Diskstation Manager

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

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    CVE-2026-40535 (CVSS 6.5) — An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Desktop API…
    CVE-2026-40533 (CVSS 5.3) — An exposure of sensitive information through data queries vulnerability in Desktop API in Synology DiskStation…
    CVE-2026-40537 (CVSS 4.3) — A server-side request forgery (SSRF) vulnerability in PersonMail API in Synology DiskStation Manager (DSM) bef…
    CVE-2026-40536 (CVSS 4.3) — An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Audio API i…
    CVE-2026-40534 (CVSS 5.4) — An improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Video…
    CVE-2026-40532 (CVSS 6.5) — A direct request ('forced browsing') vulnerability in Wallpaper Path in Synology DiskStation Manager (DSM) bef…
    CVE-2026-40531 (CVSS 4.3) — An integer overflow or wraparound vulnerability in File Operation in Synology DiskStation Manager (DSM) before…
    CVE-2026-4036 (CVSS 6.5) — An improper neutralization of special elements used in an SQL command ('SQL injection') vulnerability in Shari…
    CVE-2026-40530 (CVSS 8) — An improper neutralization of CRLF sequences ('CRLF injection') vulnerability in User API in Synology DiskStat…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High