CVE-2020-18723

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-02-03 · updated 2026-06-17
Weakness: CWE-79

Description

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.

Affected products

Altn Mdaemon Webmail: before 20.0.1 — fixed in 20.0.1

How to fix

Upgrade to a fixed version: Altn Mdaemon Webmail 20.0.1. Check the vendor advisory for mitigations.

References

http://kailashbohara.com.np/blog/2020/07/15/mdaemon-stored-xss
http://packetstormsecurity.com/files/161332/Alt-N-MDaemon-Webmail-20.0.0-Cross-Site-Scripting.html
https://www.altn.com/Support/SecurityUpdate/MD082520_MDaemon_EN/
http://kailashbohara.com.np/blog/2020/07/15/mdaemon-stored-xss
http://packetstormsecurity.com/files/161332/Alt-N-MDaemon-Webmail-20.0.0-Cross-Site-Scripting.html
https://www.altn.com/Support/SecurityUpdate/MD082520_MDaemon_EN/

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