CVE-2023-28833

Nextcloud server is an open source home cloud implementation. In affected versions admins of a server were able to upload a logo or a favicon and to provided a file name which was not restricted and could overwrite files in the appdata directory. Administrators may have access to overwrite these files by other means but this method could be exploited by tricking an admin into uploading a maliciously named file. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. Users unable to upgrade should avoid ingesting logo files from untrusted sources.

• CWE-22
• CWE-434

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-ch7f-px7m-hg25Vendor Advisory
• https://github.com/nextcloud/server/pull/36095Issue Tracking, Patch
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-ch7f-px7m-hg25Vendor Advisory
• https://github.com/nextcloud/server/pull/36095Issue Tracking, Patch

Published

Mar 30, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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