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CVE-2025-49136

Description

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.

POC

Reference

- https://github.com/knadh/listmonk/security/advisories/GHSA-jc7g-x28f-3v3h

Github

- https://github.com/ARPSyndicate/cve-scores