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Vulnerability record · CVE-2021-32655 · published 1 June 2021

CVE-2021-32655: Nextcloud server 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 convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the "Create" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. No workarounds are known to exist.

3.5 CVSS 3.1 Low EPSS 1.0% · top 37.5% CWE-241 · CWE-241
3.5CVSS 3.1 base score, v2 3.5
1.0%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 convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the "Create" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. No workarounds are known to exist.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/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-grph-cm44-p3jv Third Party Advisory
https://hackerone.com/reports/1167929 Permissions RequiredThird Party Advisory
https://security.gentoo.org/glsa/202208-17 Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-grph-cm44-p3jv Third Party Advisory
https://hackerone.com/reports/1167929 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-2021-32655), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.