by Kastro
Paper/Archive/CVE-2025-49136

CVE-2025-49136

knadh listmonk — listmonk's Sprig template Injection vulnerability leads to reading of Environment Variable for low privilege user

EPSS 2%public exploitCVSS 9.1
critical.is priorityof 100
52
CVSS 9.1 (CNA)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 75.5.755 × 2015.1Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
listmonk>= 4.0.0, < 5.0.2–CNA

Scores by source

GitHub_M (CNA)9.1CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitgithub.com/knadh/listmonk/security/advisories/GHSA-jc7g-x28f-3v3hrefgithub.com/knadh/listmonk/commit/d27d2c32cf3af2d0b24e29ea5a686ba149b49b3erefgithub.com/knadh/listmonk/releases/tag/v5.0.2