CVE-2021-32688

HighCVSS 8.8/10Last modified Jun 17, 2026

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 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-285 CWE-552

Affected software

Vendor	Product	Versions
nextcloud	security-advisories	< 19.0.13; >= 20.0.0, < 20.0.11; >= 21.0.0, < 21.0.3

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-48m7-7r2r-838rThird Party Advisory
https://github.com/nextcloud/server/pull/27000Patch, Third Party Advisory
https://hackerone.com/reports/1193321Permissions Required
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BVZS26RDME2DYTKET5AECRIZDFUGR2AZ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J63NBVPR2AQCAWRNDOZSGRY5II4WS2CZ/
https://security.gentoo.org/glsa/202208-17Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-48m7-7r2r-838rThird Party Advisory
https://github.com/nextcloud/server/pull/27000Patch, Third Party Advisory
https://hackerone.com/reports/1193321Permissions Required
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BVZS26RDME2DYTKET5AECRIZDFUGR2AZ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J63NBVPR2AQCAWRNDOZSGRY5II4WS2CZ/
https://security.gentoo.org/glsa/202208-17Third Party Advisory

Timeline

Published: Jul 12, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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