TI-2020-13450 Aliases CVE-2020-18723 GHSA-7c3h-wh3g-298c

Stored cross-site scripting (XSS) in file attachment field in MDaemon webmail 19.5.5…

LOW 31CWE-79Published 2021-02-03 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

Stored cross-site scripting (XSS) in file attachment field in MDaemon webmail 19.5.5 allows an attacker to execute code on the email recipient side while forwarding an email to perform potentially malicious activities.

Why it matters now

EPSS 0.03963 90th percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:altn:mdaemon_webmail::::::::	before 20.0.1	Vulnerable	Altn

cpe:2.3:a:altn:mdaemon_webmail:*:*:*:*:*:*:*:* Versions before 20.0.1 Vulnerable ·Altn

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-18723
2026-10-03 Alias added: GHSA-7c3h-wh3g-298c
2026-10-29 EPSS moved to the 90th–95th percentile

References

Exploit 2

Advisory 1

https://www.altn.com/Support/SecurityUpdate/MD082520_MDaemon_EN/

TI-2018-12664 MDaemon Webmail (formerly WorldClient) has CSRF. CVSS 3.0HIGH 8.8
TI-2020-13451 Authenticated stored cross-site scripting (XSS) in the contact name field in the… CVSS 3.1MEDIUM 5.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences