MJML before 5.0.0-alpha.9 allows mj-include directory traversal to test file existence and (in the type="css" case) read files. NOTE: this issue exists because of an incomplete fix for CVE-2020-12827.
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L
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