Vulnerability record · CVE-2021-32653 · published 1 June 2021

CVE-2021-32653: Nextcloud server vulnerability

Nextcloud · Nextcloud Server

Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server versions prior to 19.0.11, 20.0.10, or 21.0.2 send user IDs to the lookup server even if the user has no fields set to published. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2; no workarounds outside the updates are known to exist.

2.7 CVSS 3.1 Low EPSS 1.2% · top 32.9% CWE-201 · CWE-201

2.7CVSS 3.1 base score, v2 4.0

1.2%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

6References

17 Jun 2026Last modified by NVD

Description

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

Affected products

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

Nextcloud Server Nextcloud

References

Link	Tags
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-396j-vqpr-qg45	Third Party Advisory
https://hackerone.com/reports/1173436	Permissions RequiredThird Party Advisory
https://security.gentoo.org/glsa/202208-17	Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-396j-vqpr-qg45	Third Party Advisory
https://hackerone.com/reports/1173436	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-2021-32653), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.