Auth bypass in Nextcloud Server
CVE-2021-22877
A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own credentials for other users external storage configuration when not already configured yet.
EPSS: 0.017 (74.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Nextcloud Nextcloud_server
- Fedoraproject Fedora — versions 34
- N/a Nextcloud Server — versions Fixed in 20.0.6
Weakness classification (CWE)
References
- support@hackerone.com (Third Party Advisory, x_refsource_MISC, Issue Tracking)
- support@hackerone.com (x_refsource_MISC, Broken Link, Vendor Advisory)
- support@hackerone.com (Exploit, Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- support@hackerone.com (Patch, Third Party Advisory, x_refsource_MISC)
- support@hackerone.com (x_refsource_FEDORA, vendor-advisory)
Frequently asked questions
- What is CVE-2021-22877?
- CVE-2021-22877 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 6.5/10. Published 2021-03-03.
- How severe is CVE-2021-22877?
- Medium severity. CVSS v3 base score is 6.5 out of 10.