XSS in MDaemon Email Server Webmail
CVE-2024-11182 is a cross-site scripting vulnerability in MDaemon Email Server webmail affecting versions before 24.5.1c. The flaw can be triggered by sending a crafted HTML email containing JavaScript in an img tag; ESET reporting further indicates the exploit involved malformed HTML attributes to render a hidden img/onerror-style JavaScript payload. When a victim opens the malicious message in the vulnerable webmail interface, attacker-supplied JavaScript executes in the security context of that user’s webmail session. In observed exploitation, this was used as part of Sednit/APT28’s Operation RoundPress against high-value targets. The vulnerability enables script-based access to data available within the webmail page, including mailbox contents and session-accessible account information.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
27 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A zero-day cross-site scripting (XSS) flaw in MDaemon Email Server’s HTML rendering that enabled execution of malicious JavaScript in victims’ webmail sessions, used by Sednit/APT28 in spear-phishing (Operation RoundPress).
A zero-day vulnerability in MDaemon Email Server exploited by the Sednit group in targeted attacks against Ukrainian companies.
A zero-day cross-site scripting (XSS) vulnerability in MDaemon Email Server exploited by Fancy Bear (APT28) for targeted attacks against Ukrainian companies.
A cross-site scripting vulnerability in MDaemon Email Server webmail that can enable session hijacking and unauthorized email access.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.