CVE-2011-0528 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-0528): Puppet 2.6.0 through 2.6.3 does not properly restrict access to node resources, which allows remote authenticated Puppet nodes to read or modify the resources of other nodes via unspecified vectors. Vulnerability exists only in 2.6.* branch
Fixed a long time ago, no GLSA needed