What’s Vulnerable › Vulnerabilities

CVE-2020-28645

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-09 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Owncloud: before 10.6.0 — fixed in 10.6.0

How to fix

Upgrade to a fixed version: Owncloud 10.6.0. Check the vendor advisory for mitigations.

References

• https://owncloud.com/security-advisories/missing-user-validation-leading-to-information-disclosure/
• https://owncloud.com/security-advisories/missing-user-validation-leading-to-information-disclosure/

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