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    CVE-2023-23943

    Nextcloud mail is an email app for the nextcloud home server platform. In affected versions the SMTP, IMAP and Sieve host fields allowed to scan for internal services and servers reachable from within the local network of the Nextcloud Server. It is recommended that the Nextcloud Maill app is upgraded to 1.15.0 or 2.2.2. The only known workaround for this issue is to completely disable the nextcloud mail app.

    Published:Feb 6, 2023
    Last Modified:Mar 10, 2025
    EPS:Feb 6, 2023
    EPSS Score:0.00351
    CVSS Score:5

    Affected Products

    Vendor
    Nextcloud
    Product
    Mail

    Exploits

    https://hackerone.com/reports/1736390https://hackerone.com/reports/1741525https://hackerone.com/reports/1746582https://hackerone.com/reports/1736390https://hackerone.com/reports/1741525https://hackerone.com/reports/1746582

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-664 Server Side Request Forgery

    Related CVEs

    CVE-2025-66514 (CVSS 3.5) — Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. Prior to 5.5.3, a stored HT…
    CVE-2024-52509 (CVSS 3.5) — Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. The Nextcloud mail app inco…
    CVE-2024-52508 (CVSS 8.2) — Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. When a user is trying to se…
    CVE-2023-48307 (CVSS 3.5) — Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. Starting in version 1.13.0 …
    CVE-2023-45660 (CVSS 4.3) — Nextcloud mail is an email app for the Nextcloud home server platform. In affected versions a missing check of…
    CVE-2023-33184 (CVSS 3.5) — Nextcloud Mail is a mail app in Nextcloud. A blind SSRF attack allowed to send GET requests to services runnin…
    CVE-2023-25160 (CVSS 4.1) — Nextcloud Mail is an email app for the Nextcloud home server platform. Prior to versions 2.2.1, 1.14.5, 1.12.9…
    CVE-2023-23944 (CVSS 2) — Nextcloud mail is an email app for the nextcloud home server platform. In versions prior to 2.2.2 user's passw…
    CVE-2022-31119 (CVSS 3.1) — Nextcloud Mail is an email application for the nextcloud personal cloud product. Affected versions of Nextclou…
    CVE-2022-31132 (CVSS 8.3) — Nextcloud Mail is an email application for the nextcloud personal cloud product. Affected versions shipped wit…

    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