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SCA: security update for github.com/knadh/listmonk (GHSA-jmr4-p576-v565)

medium Tenable Cloud Security Plugin ID 436551

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - listmonk is a standalone, self-hosted, newsletter and mailing list manager. Prior to version 6.0.0, lower-
 privileged user with campaign management permissions can inject malicious JavaScript into campaigns or
 templates. When a higher-privileged user (Super Admin) views or previews this content, the XSS executes in
 their browser context, allowing the attacker to perform privileged actions such as creating backdoor admin
 accounts. The attack can be weaponized via the public archive feature, where victims simply need to visit
 a link - no preview click required. Version 6.0.0 fixes the issue. (CVE-2026-21483)

See Also

https://github.com/advisories/GHSA-jmr4-p576-v565

Plugin Details

Severity: Medium

ID: 436551

Version: Revision 1.10

Type: Local

Family: SCA Checks

Published: 1/3/2026

Updated: 6/1/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.42

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.3

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:N

CVSS Score Source: CVE-2026-21483

CVSS v3

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.9

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.4

Threat Score: 5.4

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/2/2026

Vulnerability Publication Date: 1/2/2026

Reference Information

CVE: CVE-2026-21483

cwe: CWE-79