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Bug
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Resolution: Unresolved
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Minor
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None
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Jenkins 2.138.2
As noted in the upgrade guide, resolved by adding -Dorg.kohsuke.stapler.jelly.CustomJellyContext.escapeByDefault=false to server configuration.
Noted on wiki as well.
Context: https://wiki.jenkins.io/display/JENKINS/Plugins+affected+by+2018-10-10+Stapler+security+hardening