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Vulnerability record · CVE-2021-27180 · published 14 April 2021

CVE-2021-27180: Altn mdaemon cross-site scripting vulnerability

Altn · Mdaemon

An issue was discovered in MDaemon before 20.0.4. There is Reflected XSS in Webmail (aka WorldClient). It can be exploited via a GET request. It allows performing any action with the privileges of the attacked user.

6.1 CVSS 3.1 Medium EPSS 0.93% · top 41.1% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
0.93%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in MDaemon before 20.0.4. There is Reflected XSS in Webmail (aka WorldClient). It can be exploited via a GET request. It allows performing any action with the privileges of the attacked user.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/chudyPB/MDaemon-Advisories ExploitThird Party Advisory
https://www.altn.com/Support/SecurityUpdate/MD011221_MDaemon_EN/ PatchVendor Advisory
https://github.com/chudyPB/MDaemon-Advisories ExploitThird Party Advisory
https://www.altn.com/Support/SecurityUpdate/MD011221_MDaemon_EN/ PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2021-27181Altn mdaemon cross-site request forgery vulnerabilityAn issue was discovered in MDaemon before 20.0.4. Remote Administration allows an attacker to perform a fixation of the anti-CSRF token. In order to …EPSS 0.65%8.8CVE-2021-27182Altn mdaemon injection vulnerabilityAn issue was discovered in MDaemon before 20.0.4. There is an IFRAME injection vulnerability in Webmail (aka WorldClient). It can be exploited via an…EPSS 1.6%7.2CVE-2021-27183Altn mdaemon vulnerabilityAn issue was discovered in MDaemon before 20.0.4. Administrators can use Remote Administration to exploit an Arbitrary File Write vulnerability. An a…EPSS 2.7%6.5CVE-2008-1358MDaemon IMAP Server Stack Buffer Overflow via FETCH BODYAlt-N MDaemon 9.6.4 contains a stack-based buffer overflow in its IMAP server, triggered by a FETCH command with an overly long BODY argument. A remo…EPSS 57%analysed6.1CVE-2019-8983Altn mdaemon cross-site scripting vulnerabilityMDaemon Webmail 14.x through 18.x before 18.5.2 has XSS (issue 1 of 2).EPSS 0.79%6.1CVE-2019-8984Altn mdaemon cross-site scripting vulnerabilityMDaemon Webmail 14.x through 18.x before 18.5.2 has XSS (issue 2 of 2).EPSS 0.79%5.4CVE-2022-29975Altn mdaemon cross-site scripting vulnerabilityAn Authenticated Reflected Cross-site scripting at CC Parameter was discovered in MDaemon before 22.0.0 .EPSS 0.49%5.4CVE-2022-29976Altn mdaemon cross-site scripting vulnerabilityAn Authenticated Reflected Cross-site scripting at BCC Parameter was discovered in MDaemon before 22.0.0 .EPSS 0.49%

Source: NIST National Vulnerability Database (record CVE-2021-27180), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.