*DESCRIPTION* A security vulnerability was recently discovered by Peter Cock at the James Hutton Institute that would allow a malicious actor to upload new versions to repositories on which they have not been granted access. *AFFECTED VERSIONS* This issue affects versions of the Tool Shed beginning with 15.01. Earlier versions are not affected. *IMPACT* Because the Tool Shed is used to install software in Galaxy, if exploited, the impact could result in arbitrary code execution on Galaxy servers if a malicious tool is uploaded to a previously trusted repository, and that compromised version is subsequently installed by a Galaxy administrator. As such, Tool Shed administrators are strongly encouraged to update immediately. *INSTRUCTIONS* To apply the fix, first identify your current Galaxy release version using the `git branch` or `hg branch` commands. If you are on a 'release_YY.MM' branch, you can update with: % git pull or: % hg pull -u The process above can also be used to update to the 15.07 release if you are on the 'master' git branch or the 'stable' hg branch. If you are on the 'master'/'stable' branch and wish to remain on your current Galaxy major release, check the 'lib/galaxy/version.py' file to determine your major release version, then update to the appropriate branch: % git checkout -b release_YY.MM origin/release_YY.MM % git pull or: % hg pull % hg update release_YY.MM For the changes to take effect, YOU MUST RESTART ALL TOOL SHED SERVER PROCESSES. On behalf of the Galaxy Committers, --nate