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Vulnerability record · CVE-2020-28645 · published 9 February 2021

CVE-2020-28645: Owncloud improper input validation vulnerability

Owncloud · Owncloud

Deleting users with certain names caused system files to be deleted. Risk is higher for systems which allow users to register themselves and have the data directory in the web root. This affects ownCloud/core versions < 10.6.

9.1 CVSS 3.1 Critical EPSS 1.2% · top 32.1% CWE-20 · Improper input validation
9.1CVSS 3.1 base score, v2 5.0
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Deleting users with certain names caused system files to be deleted. Risk is higher for systems which allow users to register themselves and have the data directory in the web root. This affects ownCloud/core versions < 10.6.

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

Affected products

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

References

LinkTags
https://owncloud.com/security-advisories/missing-user-validation-leading-to-information-disclosure/ Vendor Advisory
https://owncloud.com/security-advisories/missing-user-validation-leading-to-information-disclosure/ Vendor 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-2020-28645), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.