CVE-2026-107448CWE-99

CVE-2026-107448

Low · published October 8, 2026

CVSS v3.1
3.4
EPSS
0%
Percentile
3.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.4 · LOW
Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00144 · 3.4th percentile
Weakness
CWE-99 · Improper Control of Resource Identifiers ('Resource Injection')
Published
2026-10-08T08:17Z
References (2)
https://github.com/N0tMilk/vulnerability-research/blob/main/Magic/carousel-shellexecute-mtga.md · [email protected]https://github.com/N0tMilk/vulnerability-research/blob/main/Magic/carousel-shellexecute-mtga.md · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 09 OCT 03:26Z
    EPSS moved — → 0%
    epss
  • 08 OCT 03:57Z
    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…
    cvelistv5
  • 08 OCT 03:57Z
    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…
    cvelistv5