CVE-2024-11182
CVE-2024-11182 is a security flaw in MDaemon Email Server. Attackers can run code in the browser of someone using MDaemon Email Server and act as them. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 19 May 2025.[1]
MDaemon Email Server is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. MDaemon has published a fix or advice.
Description
CISA calls it a cross-site scripting (XSS) in MDaemon Email Server. In its words: “MDaemon Email Server contains a cross-site scripting (XSS) vulnerability that allows a remote attacker to load arbitrary JavaScript code via an HTML e-mail message.”[1]
The CVE record adds: “An XSS issue was discovered in MDaemon Email Server before version 24.5.1c. An attacker can send an HTML e-mail message with JavaScript in an img tag. This could allow a remote attacker to load arbitrary JavaScript code in the context of a webmail user's browser window.”[2]
The underlying weakness is cross-site scripting (CWE-79), in MITRE’s list of common software weaknesses.
It scores 6.1 out of 10 on the Common Vulnerability Scoring System, which rates it medium, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it; MDaemon’s advisory has them[3]. CISA names the product as MDaemon Email Server.
Most families won’t have MDaemon Email Server; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 19 May 2025, 185 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 9 Jun 2025 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 33%. That’s in the top 2% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
MDaemon has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]
- Check whether you use it.MDaemon Email Server is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 9 Jun 2025 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 6.1.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 33%.[4] |
See also
Other cross-site scripting flaws
- CVE-2026-42897, Microsoft: exchange server cross-site scripting ·
- CVE-2025-48700, Synacor Zimbra Collaboration Suite (ZCS): cross-site scripting ·
- CVE-2025-66376, Synacor Zimbra Collaboration Suite (ZCS): cross-site scripting ·
- CVE-2025-68461, Roundcube Webmail: cross-site scripting ·
- CVE-2021-26829, OpenPLC ScadaBR: cross-site scripting ·
Added the same day
- CVE-2025-4428, Ivanti Endpoint Manager Mobile (EPMM): code injection ·
- CVE-2025-4427, Ivanti Endpoint Manager Mobile (EPMM): authentication bypass ·
- CVE-2025-27920, Srimax Output Messenger: directory traversal ·
- CVE-2024-27443, Synacor Zimbra Collaboration Suite (ZCS): cross-site scripting (XSS) ·
- CVE-2023-38950, ZKTeco BioTime: path traversal ·
References
- ^ Cybersecurity and Infrastructure Security Agency. “MDaemon Email Server Cross-Site Scripting (XSS) Vulnerability”. Known Exploited Vulnerabilities Catalog, added 19 May 2025.
- ^ National Institute of Standards and Technology. “CVE-2024-11182 Detail”. National Vulnerability Database, published 15 Nov 2024.
- ^ MDaemon. Advisories and fixes: files.mdaemon.com, mdaemon.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.333, percentile 98.4, 31 Oct 2026.
- CVE Program. “CVE-2024-11182”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.