How severe is CVE-2025-49136?

CVE-2025-49136 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-49136 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-49136?

CVE-2025-49136 affects Nadh Listmonk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-49136?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-49136 have an EU (EUVD) identifier?

Yes. CVE-2025-49136 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-17462.

When was CVE-2025-49136 published?

CVE-2025-49136 was published on 2025-06-09 and last updated on 2026-06-17.

CVE-2025-49136

CVE-2025-49136 is a critical-severity vulnerability in Nadh Listmonk with a CVSS 3.x base score of 9.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1336.

Key facts

Severity: Critical (CVSS 3.x base score 9.0)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-17462
Weakness: CWE-1336
Affected product: Nadh Listmonk
Published: 2025-06-09
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-49136?: 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.
How severe is CVE-2025-49136?: CVE-2025-49136 has a CVSS 3.x base score of 9.0, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-49136 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-49136?: CVE-2025-49136 affects Nadh Listmonk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-49136?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-49136 have an EU (EUVD) identifier?: Yes. CVE-2025-49136 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-17462.
When was CVE-2025-49136 published?: CVE-2025-49136 was published on 2025-06-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nadh:listmonk:*:*:*:*:*:*:*:*

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