CVE-2026-104083 (GCVE-0-2026-104083)

Vulnerability from cvelistv5 – Published: 2026-10-09 15:06 – Updated: 2026-10-09 15:06
VLAI
Title
SmarterMail < Build 9777 Stored Mutation XSS via MathML Foreign Content
Summary
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.
Severity
5.3 (Medium)
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
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 5277 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Smartertools Smartermail Affected: 0 , < Build 9777 (custom)
guessed Create a notification for this product.
Date Public
2026-10-08 00:00
Credits
evan
Show details on NVD website
To clipboard 

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        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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          "url": "https://www.smartertools.com/smartermail/release-notes/current#/9526:~:text=Build%209777%20(Oct%208%2C%202026)"
        },
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      "source": {
        "discovery": "UNKNOWN"
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      "title": "SmarterMail \u003c Build 9777 Stored Mutation XSS via MathML Foreign Content",
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    "dateReserved": "2026-10-01T18:02:50.084Z",
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          }
        ],
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        "lastModified": "2026-10-09T17:06:17.770",
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                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
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                "privilegesRequired": "NONE",
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}



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