What’s Vulnerable › Vulnerabilities

CVE-2019-15623

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-02-04 · updated 2026-06-17
• Weakness: CWE-359

Description

Exposure of Private Information in Nextcloud Server 16.0.1 causes the server to send it's domain and user IDs to the Nextcloud Lookup Server without any further data when the Lookup server is disabled.

Affected products

• Nextcloud Server: before 14.0.13; from 15.0.0 before 15.0.9; from 16.0.0 before 16.0.2 — fixed in 14.0.13, 15.0.9, 16.0.2
• openSUSE Backports Sle: 15.0-sp1
• SUSE Package Hub: all versions

How to fix

Upgrade to a fixed version: Nextcloud Server 14.0.13, 15.0.9, 16.0.2. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00019.html
• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00022.html
• https://hackerone.com/reports/508490
• https://nextcloud.com/security/advisory/?id=NC-SA-2019-016
• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00019.html
• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00022.html
• https://hackerone.com/reports/508490
• https://nextcloud.com/security/advisory/?id=NC-SA-2019-016

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