Vulnerability CVE-2021-22877
Published: 2021-03-03

Description:
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.

Type:

CWE-269

 (Improper Privilege Management)

CVSS2 => (AV:N/AC:L/Au:S/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5.5/10
4.9/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None
Affected software
Nextcloud -> Nextcloud 

 References:
https://github.com/nextcloud/server/issues/24600
https://github.com/nextcloud/server/pull/25224
https://hackerone.com/reports/1061591
https://nextcloud.com/security/advisory/?id=NC-SA-2021-004
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