Description
In Webbukkit Dynmap 3.0-beta-3 or below, due to a missing login check in servlet/MapStorageHandler.java, an attacker can see a map image without login even if victim enables login-required in setting.
Remediation
References
https://github.com/webbukkit/dynmap/pull/2475
https://github.com/webbukkit/dynmap/issues/2474
https://github.com/webbukkit/dynmap/commit/641f142cd3ccdcbfb04eda3059be22dd9ed93783
http://jvn.jp/en/jp/JVN89046645/index.html