MJML through 4.18.0 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.
https://github.com/mjmlio/mjml/issues/3018
Source: Mitre, NVD
Published: 2025-12-14
Updated: 2026-04-15
Base Score: 2.6
Vector: CVSS2#AV:L/AC:H/Au:N/C:P/I:N/A:P
Severity: Low
Base Score: 4.5
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L
Severity: Medium
EPSS: 0.00015