{"cve":"CVE-2026-21483","nvd":{"published":"2026-01-02T21:16:03.217","modified":"2026-06-17T10:18:42.023","status":"Analyzed","description":"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.","cvss_v4":{"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/E:P","score":5.4},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4},"cwes":["CWE-79"],"references":["https://github.com/knadh/listmonk/security/advisories/GHSA-jmr4-p576-v565"],"products":["nadh:listmonk"],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2026-21483","score":0.00226,"percentile":0.13294,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jmr4-p576-v565","url":"https://osv.dev/vulnerability/GHSA-jmr4-p576-v565","summary":"listmonk Vulnerable to Stored XSS Leading to Admin Account Takeover","modified":"2026-02-03T03:14:11.589130Z","packages":[{"ecosystem":"Go","name":"github.com/knadh/listmonk","purl":"pkg:golang/github.com/knadh/listmonk","ranges":[">=1.1.1 <6.0.0"],"fixed":["6.0.0"]},{"ecosystem":"Go","name":"github.com/knadh/listmonk","purl":"pkg:golang/github.com/knadh/listmonk","ranges":["<1.1.1-0.20251231125615-74dc5a01cfbb"],"fixed":["1.1.1-0.20251231125615-74dc5a01cfbb"]}]},{"id":"GO-2026-4277","url":"https://osv.dev/vulnerability/GO-2026-4277","summary":"listmonk Vulnerable to Stored XSS Leading to Admin Account Takeover in github.com/knadh/listmonk","modified":"2026-01-12T18:11:10.248518Z","packages":[{"ecosystem":"Go","name":"github.com/knadh/listmonk","purl":"pkg:golang/github.com/knadh/listmonk","ranges":["<1.1.1-0.20251231125615-74dc5a01cfbb"],"fixed":["1.1.1-0.20251231125615-74dc5a01cfbb"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}