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Vulnerability record · CVE-2026-107448 · published 8 October 2026

CVE-2026-107448: Magic: The Gathering Arena (Windows/Steam client; 2026.59.30.12801.127931.6 and certain later 2026.60.x builds…

Magic: The Gathering Arena (Windows/Steam client; 2026.59.30.12801.127931.6 and certain later 2026.60.x builds) passes a server-supplied URL from a home-screen carousel GoToExternalUrl action directly to the Windows shell via Application.OpenURL/ShellExecuteW without validating the URI scheme or domain. A hypothetical attacker able to control the carousel content delivered to clients can cause arbitrary registered URI-scheme handlers to be invoked on client hosts with no user interaction. For example, one might expect that the carousel content only has https: URIs, not ms-calculator: URIs.

3.4 CVSS 3.1 Low EPSS 0.14% · top 96.8% CWE-99 · CWE-99 Awaiting Analysis
3.4CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
8 Oct 2026Last modified by NVD

Description

Magic: The Gathering Arena (Windows/Steam client; 2026.59.30.12801.127931.6 and certain later 2026.60.x builds) passes a server-supplied URL from a home-screen carousel GoToExternalUrl action directly to the Windows shell via Application.OpenURL/ShellExecuteW without validating the URI scheme or domain. A hypothetical attacker able to control the carousel content delivered to clients can cause arbitrary registered URI-scheme handlers to be invoked on client hosts with no user interaction. For example, one might expect that the carousel content only has https: URIs, not ms-calculator: URIs.

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

References

LinkTags
https://github.com/N0tMilk/vulnerability-research/blob/main/Magic/carousel-shellexecute-mtga.md

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Source: NIST National Vulnerability Database (record CVE-2026-107448), CISA KEV, FIRST EPSS (scores of 2026-10-08). This page is refreshed as NVD updates the record.