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Vulnerability record · CVE-2021-32654 · published 1 June 2021

CVE-2021-32654: Nextcloud server insecure direct object reference vulnerability

Nextcloud · Nextcloud Server

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to receive write/read privileges on any Federated File Share. Since public links can be added as federated file share, this can also be exploited on any public link. Users can upgrade to patched versions (19.0.11, 20.0.10 or 21.0.2) or, as a workaround, disable federated file sharing.

9.1 CVSS 3.1 Critical EPSS 1.8% · top 21.8% CWE-639 · Insecure direct object reference
9.1CVSS 3.1 base score, v2 6.4
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to receive write/read privileges on any Federated File Share. Since public links can be added as federated file share, this can also be exploited on any public link. Users can upgrade to patched versions (19.0.11, 20.0.10 or 21.0.2) or, as a workaround, disable federated file sharing.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jf9h-v24c-22g5 Third Party Advisory
https://hackerone.com/reports/1170024 Permissions RequiredThird Party Advisory
https://security.gentoo.org/glsa/202208-17 Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jf9h-v24c-22g5 Third Party Advisory
https://hackerone.com/reports/1170024 Permissions RequiredThird Party Advisory
https://security.gentoo.org/glsa/202208-17 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-32654), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.