SmarterMail before build 9777 contains a stored mutation cross-site scripting vulnerability that allows remote attackers to inject executable script by placing payloads inside a <style> element nested within MathML foreign content (<math><mtext><mglyph>), which the custom HTML sanitizer treats as inert CDATA text but browsers reparse as live markup. Attackers can deliver a crafted calendar (iCal) message containing an <img src=x onerror=...> payload that executes automatically in the recipient's webmail session at /interface/message-iframe when the message is opened, enabling script execution and data exfiltration unconstrained by the interface's permissive Content-Security-Policy.
Metrics
Affected Vendors & Products
References
History
Tue, 27 Oct 2026 04:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:smartertools:smartermail:-:*:*:*:*:*:*:* |
Tue, 13 Oct 2026 18:30:00 +0000
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| Metrics |
ssvc
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Mon, 12 Oct 2026 14:00:00 +0000
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| References |
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Fri, 09 Oct 2026 17:00:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Smartertools
Smartertools smartermail |
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| Vendors & Products |
Smartertools
Smartertools smartermail |
Fri, 09 Oct 2026 15:30:00 +0000
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| Description | SmarterMail before build 9777 contains a stored mutation cross-site scripting vulnerability that allows remote attackers to inject executable script by placing payloads inside a <style> element nested within MathML foreign content (<math><mtext><mglyph>), which the custom HTML sanitizer treats as inert CDATA text but browsers reparse as live markup. Attackers can deliver a crafted calendar (iCal) message containing an <img src=x onerror=...> payload that executes automatically in the recipient's webmail session at /interface/message-iframe when the message is opened, enabling script execution and data exfiltration unconstrained by the interface's permissive Content-Security-Policy. | |
| Title | SmarterMail < Build 9777 Stored Mutation XSS via MathML Foreign Content | |
| Weaknesses | CWE-79 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-10-09T15:06:57.154Z
Updated: 2026-10-27T01:30:36.776Z
Reserved: 2026-10-01T18:02:50.084Z
Link: CVE-2026-104083
Updated: 2026-10-13T16:54:28.422Z
Status : Awaiting Analysis
Published: 2026-10-09T16:17:20.993
Modified: 2026-10-13T17:17:15.500
Link: CVE-2026-104083
No data.