Sensitive data on the Swedish RBS-15 anti-ship missile system has been posted online since last year.
By Suradnik13 (Own work) [CC BY-SA 4.0-3.0-2.5-2.0-1.0], via Wikimedia Commons
The data was obtained by a visitor to the War Archive in Stockholm. The person took pictures of the data using mobile phone and posted it on a website. The information was later posted on a Russian forum.