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.
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

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 12 Oct 2026 14:00:00 +0000

Type Values Removed Values Added
References

Fri, 09 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
First Time appeared Smartertools
Smartertools smartermail
Vendors & Products Smartertools
Smartertools smartermail

Fri, 09 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
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
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}


cve-icon MITRE

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

cve-icon Vulnrichment

Updated: 2026-10-13T16:54:28.422Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-09T16:17:20.993

Modified: 2026-10-13T17:17:15.500

Link: CVE-2026-104083

cve-icon Redhat

No data.