Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') Affecting github.com/knadh/listmonk/internal/manager package, versions >=4.0.0 <5.0.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-GOLANG-GITHUBCOMKNADHLISTMONKINTERNALMANAGER-10379733
- published18 Jun 2025
- disclosed9 Jun 2025
- creditNakkouch Tarek
Introduced: 9 Jun 2025
CVE-2025-49136 (opens in a new tab)How to fix?
Upgrade github.com/knadh/listmonk/internal/manager to version 5.0.2 or higher.
Overview
Affected versions of this package are vulnerable to Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') through the use of template functions env and expandenv, which are enabled by default. An attacker can extract sensitive system data, including database credentials, SMTP passwords, and admin credentials by crafting malicious template content in the campaign preview functionality.
Note:
This is only exploitable if the user has campaigns:get and campaigns:get_all privileges.
Workaround
This vulnerability can be mitigated by blacklisting some functions for templates like env, expandEnv and fail as they can be used to leak environment variables which leads to a full takeover.