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CVE-2021-32688 Details

Description

Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server supports application specific tokens for authentication purposes. These tokens are supposed to be granted to a specific applications (e.g. DAV sync clients), and can also be configured by the user to not have any filesystem access. Due to a lacking permission check, the tokens were able to change their own permissions in versions prior to 19.0.13, 20.0.11, and 21.0.3. Thus fileystem limited tokens were able to grant themselves access to the filesystem. The issue is patched in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds aside from upgrading.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-48m7-7r2r-838r	CVE	Third Party Advisory
https://github.com/nextcloud/server/pull/27000	CVE	PatchThird Party Advisory
https://hackerone.com/reports/1193321	CVE	Permissions Required
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BVZS26RDME2DYTKET5AECRIZDFUGR2AZ/	CVE
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J63NBVPR2AQCAWRNDOZSGRY5II4WS2CZ/	CVE
https://security.gentoo.org/glsa/202208-17	CVE	Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-48m7-7r2r-838r	[email protected]	Third Party Advisory
https://github.com/nextcloud/server/pull/27000	[email protected]	PatchThird Party Advisory
https://hackerone.com/reports/1193321	[email protected]	Permissions Required
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BVZS26RDME2DYTKET5AECRIZDFUGR2AZ/	[email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J63NBVPR2AQCAWRNDOZSGRY5II4WS2CZ/	[email protected]
https://security.gentoo.org/glsa/202208-17	[email protected]	Third Party Advisory

see all 12 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-552	Files or Directories Accessible to External Parties	[email protected]
CWE-285	Improper Authorization	[email protected]

Affected Products

Product	Versions
nextcloud nextcloud server	< 19.0.13 >= 20.0.0, < 20.0.11 >= 21.0.0, < 21.0.3
CPE cpe:2.3:a:nextcloud:nextcloud_server:::::::: Remediation No remediation found in references.
fedoraproject fedora	33 34
CPE cpe:2.3:o:fedoraproject:fedora:33:::::::* cpe:2.3:o:fedoraproject:fedora:34:::::::* Remediation No remediation found in references.

Change History

9 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Nov 7, 2023	CVE Modified	[email protected]
Oct 26, 2022	Modified Analysis	[email protected]
Aug 11, 2022	CVE Modified	[email protected]
Sep 20, 2021	Modified Analysis	[email protected]
Jul 22, 2021	CVE Modified	[email protected]
Jul 15, 2021	Initial Analysis	[email protected]