CVE-2021-32688

Name: CVE-2021-32688
Creator: NVD / NIST
Published: 2021-07-12T14:15:08.3+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.31%

Last modified Jun 17, 2026

CVE-2021-32688 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server supports application specific tokens for authentication purposes. EPSS estimates a 2.31% chance of exploitation in the next 30 days.

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

8.8/10

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

EPSS Probability

2.31%

81.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	< 19.0.13
Nextcloud	Nextcloud Server	>= 20.0.0, < 20.0.11
Nextcloud	Nextcloud Server	>= 21.0.0, < 21.0.3
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34

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
Status: Modified

Frequently Asked Questions

What is CVE-2021-32688?

How severe is CVE-2021-32688?

CVE-2021-32688 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.31% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32688?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32688?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST