listmonk is a standalone, self-hosted, newsletter and mailing list manager. Starting in version 4.0.0 and prior to version 5.0.2, the `env` and `expandenv` template functions which is enabled by default in Sprig enables capturing of env variables on host. While this may not be a problem on single-user (super admin) installations, on multi-user installations, this allows non-super-admin users with campaign or template permissions to use the `{{ env }}` template expression to capture sensitive environment variables. Users should upgrade to v5.0.2 to mitigate the issue.
CVE ID: CVE-2025-49136
CVSS Base Severity: CRITICAL
CVSS Base Score: 9.1
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Vendor: knadh
Product: listmonk
EPSS Score: 0.03% (probability of being exploited)
EPSS Percentile: 7.6% (scored less or equal to compared to others)
EPSS Date: 2025-07-05 (when was this score calculated)