Ncsc-Pt

**Name of the Vulnerable Software and Affected Versions** ArchiMate Archi versions prior to 5.1.0 **Description** An NTLM Hash Disclosure issue was discovered. When parsing the XMLNS value of an ArchiMate project file, if the namespace does not match the expected ArchiMate URL, the parser will access the provided resource. If the provided resource is a UNC path pointing to a share server that does not accept a guest account, the host will try to authenticate on the share by using the current user's session. This issue occurs because Archi uses an unsafe configuration of the Eclipse Modeling Framework. **Recommendations** For versions prior to 5.1.0, update to version 5.1.0 or later to resolve the issue. As a temporary workaround, consider restricting access to UNC paths that may trigger the authentication attempt until a patch is applied. Avoid using the XMLNS value to reference resources on share servers that do not accept guest accounts.