Home/CVE/A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own credentials for other users exter
CVE

CVE-2021-22877

A missing user check in Nextcloud prior to 20.0.6 inadvertently populates a user's own credentials for other users exter

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.

MEDIUM · CVSS 6.5 EPSS 0.00279
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-284Improper Access Control
CWE-862Missing Authorization
▤

Affected Products & Versions

2
nextcloud server< 20.0.6
fedoraproject fedoraall versions
⚠

Public Exploits & PoCs

1
pocgithub.com · 24600github.com
▣

Scoring & Timeline

6.5
MEDIUM · CVSS v3.1 · support@hackerone.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD03 Mar 2021 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/nextcloud/server/pull/25224PatchThird Party Advisory
https://hackerone.com/reports/1061591Issue TrackingThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6BO6P6MP2MOWA6PZRXX32PLWPXN5O4S/
https://nextcloud.com/security/advisory/?id=NC-SA-2021-004Broken LinkVendor Advisory
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