CVE-2020-18723

Name: CVE-2020-18723
Creator: NVD / NIST
Published: 2021-02-03T18:15:16.053+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 3.80%

Last modified Jun 17, 2026

CVE-2020-18723 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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.. EPSS estimates a 3.80% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.4/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

3.80%

88.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Altn	Mdaemon Webmail	< 20.0.1

References

http://kailashbohara.com.np/blog/2020/07/15/mdaemon-stored-xssExploit, Third Party Advisory
http://packetstormsecurity.com/files/161332/Alt-N-MDaemon-Webmail-20.0.0-Cross-Site-Scripting.htmlExploit, Third Party Advisory, VDB Entry
https://www.altn.com/Support/SecurityUpdate/MD082520_MDaemon_EN/Vendor Advisory
http://kailashbohara.com.np/blog/2020/07/15/mdaemon-stored-xssExploit, Third Party Advisory
http://packetstormsecurity.com/files/161332/Alt-N-MDaemon-Webmail-20.0.0-Cross-Site-Scripting.htmlExploit, Third Party Advisory, VDB Entry
https://www.altn.com/Support/SecurityUpdate/MD082520_MDaemon_EN/Vendor Advisory

Timeline

Published: Feb 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-18723?

How severe is CVE-2020-18723?

CVE-2020-18723 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 3.80% probability of exploitation in the next 30 days.

How do I fix CVE-2020-18723?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-18723?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST