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CVE-2025-49136— listmonk's Sprig template Injection vulnerability leads to reading of Environment Variable for low privilege user

Quick assessment

Affected
knadh listmonk
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

listmonk是Kailash Nadh个人开发者的一个具有现代仪表板的高性能、自托管、时事通讯和邮件列表管理器。 listmonk 5.0.2之前版本存在安全漏洞，该漏洞源于模板函数捕获环境变量，可能导致敏感信息泄露。

CVSS 9.1 · Critical EPSS 1.54% · P74

Public Exploits 1

Metasploit · 1 listmonk_env_disclosure.rb [auxiliary]
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I. Basic Information for CVE-2025-49136

Vulnerability Information
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Vulnerability Title
listmonk's Sprig template Injection vulnerability leads to reading of Environment Variable for low privilege user
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5
Vulnerability Title
listmonk 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
listmonk是Kailash Nadh个人开发者的一个具有现代仪表板的高性能、自托管、时事通讯和邮件列表管理器。 listmonk 5.0.2之前版本存在安全漏洞，该漏洞源于模板函数捕获环境变量，可能导致敏感信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
knadh listmonk >= 4.0.0, < 5.0.2 -

II. Public POCs for CVE-2025-49136

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 20179 chars
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III. Intelligence Information for CVE-2025-49136

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Vendor Advisories for CVE-2025-49136 (1)

IV. Related Vulnerabilities

Same product: listmonk
Same vendor: knadh
Same weakness: CWE-1336

V. Comments for CVE-2025-49136

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