CVSS 4.0
5.4 mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:PCVE-2026-21483
Medium (5.4) in nadh listmonk. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/knadh/listmonk 1.1.1-0.20251231125615-74dc5a01cfbb, 6.0.0.
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.
Severity
CVSS 3.1
5.4 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 13% of CVEs (scores of 2026-10-31)
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Affected
- nadh:listmonk
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-jmr4-p576-v565 | Go | github.com/knadh/listmonk | >=1.1.1 <6.0.0 | 6.0.0 |
| GHSA-jmr4-p576-v565 | Go | github.com/knadh/listmonk | <1.1.1-0.20251231125615-74dc5a01cfbb | 1.1.1-0.20251231125615-74dc5a01cfbb |
| GO-2026-4277 | Go | github.com/knadh/listmonk | <1.1.1-0.20251231125615-74dc5a01cfbb | 1.1.1-0.20251231125615-74dc5a01cfbb |