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FooSun DotNetCMS 1.0 and 2.0 contains an SQL injection vulnerability that allows unauthenticated attackers to manipulate MSSQL queries through the CityId parameter. Attackers can send GET requests to /user/Cityajax.aspx with UNION SELECT payloads in CityId, concatenated unsanitized into the sysCity query, to extract database information. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-14.