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Vulnerability record · CVE-2021-27182 · published 14 April 2021

CVE-2021-27182: Altn mdaemon injection vulnerability

Altn · Mdaemon

An 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 email message. It allows an attacker to perform any action with the privileges of the attacked user.

8.8 CVSS 3.1 High EPSS 1.6% · top 25.9% CWE-74 · Injection
8.8CVSS 3.1 base score, v2 6.5
1.6%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 an IFRAME injection vulnerability in Webmail (aka WorldClient). It can be exploited via an email message. It allows an attacker to perform any action with the privileges of the attacked user.

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

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/ Release NotesVendor Advisory
https://github.com/chudyPB/MDaemon-Advisories ExploitThird Party Advisory
https://www.altn.com/Support/SecurityUpdate/MD011221_MDaemon_EN/ Release NotesVendor 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%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-2021-27180Altn mdaemon cross-site scripting vulnerabilityAn 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 allo…EPSS 0.93%6.1CVE-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-2021-27182), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.