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Patch #6 Released for V2.3.8
Security Vulnerability - All Exponent Versions - August 2016
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Updated Patches released for v2.1.4 and v2.2.3
Though they are both extremely old versions, they were the release before a major version change and are/may still be in use. Please bear in mind we strongly recommend your installations be updated to a much newer version which contains many more fixes and new features. Having said that, these patches (v2.1.4patch9 and v2.2.3patch12) fix a security vulnerability reported by Balisong which might allow uploaded scripts to be executed.
You can find the patches here.