Jenkins Email Extension Plugin 1933.v45cec755423f and earlier contains an arbitrary file read vulnerability in its email image inlining feature. The plugin supports inlining images as base64 in email content when the data-inline attribute is set, but it does not restrict the URL schemes or locations that may be used for those images. An attacker able to control the email content can supply file: URLs as image sources, causing the plugin to read local files from the Jenkins controller filesystem and embed their contents into generated email output.
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