What’s Vulnerable › Vulnerabilities

CVE-2022-39346: Missing length validation of user displayname in nextcloud server

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-11-25 · updated 2026-06-17
• Weakness: CWE-20

Description

Nextcloud server is an open source personal cloud server. Affected versions of nextcloud server did not properly limit user display names which could allow a malicious users to overload the backing database and cause a denial of service. It is recommended that the Nextcloud Server is upgraded to 22.2.10, 23.0.7 or 24.0.3. There are no known workarounds for this issue.

Affected products

• Fedoraproject Fedora: 35, 36, 37
• Nextcloud Enterprise Server: before 22.2.10; from 23.0.0 before 23.0.7; from 24.0.0 before 24.0.3 — fixed in 22.2.10, 23.0.7, 24.0.3
• Nextcloud Server: before 22.2.10; from 23.0.0 before 23.0.7; from 24.0.0 before 24.0.3 — fixed in 22.2.10, 23.0.7, 24.0.3

How to fix

Upgrade to a fixed version: Nextcloud Enterprise Server 22.2.10, 23.0.7, 24.0.3; Nextcloud Server 22.2.10, 23.0.7, 24.0.3. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6w9f-jgjx-4vj6
• https://github.com/nextcloud/server/pull/33052
• https://hackerone.com/reports/1588562
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TARDPRPBTI5TJRBYRVVQGTL6KWRCV5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R32L3P53AQKQQC652LA5U3AWFTZKPDK3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TRAER4DCCHHSUDFHQ6LTIH4JEJFF73IU/
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6w9f-jgjx-4vj6
• https://github.com/nextcloud/server/pull/33052
• https://hackerone.com/reports/1588562
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42TARDPRPBTI5TJRBYRVVQGTL6KWRCV5/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R32L3P53AQKQQC652LA5U3AWFTZKPDK3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TRAER4DCCHHSUDFHQ6LTIH4JEJFF73IU/

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