Vulnerabilities in Windu CMS software

CERT Polska has received a report about vulnerabilities in Windu CMS software and participated in coordination of their disclosure.

The vulnerabilityCVE-2026-57309: A Blind SQL injection vulnerability has been identified in Windu CMS. A remote unauthenticated attacker is able to inject SQL syntax into URL path in HTTP header resulting in a successful attack.

The vulnerabilityCVE-2026-57310: Windu CMS uses hashing algorithm based on MD5 and SHA1 with static salt to store user passwords. This allows an attacker who obtain password hash to crack it and recover user credentials.

The vulnerabilityCVE-2026-57311: Windu CMS does not validate types of uploaded files. An authenticated attacker can upload arbitrary files, including PHP. This can lead to Remote Code Execution.

The vulnerabilities have only been confirmed in version 4.1 but may also affect other versions.

We thank Karol Czubernat, Jakub Lipiński, Marek Tołczyk and Kamil Królikowski for reporting CVE-2026-57311 vulnerability and we thank Jakub Lipiński, Marek Tołczyk and Kamil Królikowski for reporting rest of the vulnerabilities.