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TI-2026-69371 Aliases CVE-2026-107448GHSA-25hq-wqc9-cgfc

Magic: The Gathering Arena passes unvalidated carousel URLs to Windows shell

Priority MEDIUM 50CWE-99Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

The Windows and Steam client of Magic: The Gathering Arena from 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 straight to the Windows shell through Application.OpenURL/ShellExecuteW, without checking the URI scheme or domain. An attacker who controls the carousel content sent to clients can invoke arbitrary registered URI-scheme handlers on client hosts with no user interaction. This is CWE-99 with a CVSS 3.1 base score of 3.4 (LOW).

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00202 10th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Wizards of the CoastMagic: The Gathering Arena2026.59.30.12801.127931.6—No fix listedCNA
  • Magic: The Gathering Arena VendorWizards of the Coast Affected 2026.59.30.12801.127931.6 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for Magic: The Gathering Arena from 2026.59.30.12801.127931.6 onward. Track Wizards of the Coast for a fixed release.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-08 Threatist record created from CVE-2026-107448
  2. 2026-10-08 Alias added: GHSA-25hq-wqc9-cgfc
  3. 2026-10-10 CISA SSVC decision points changed
  4. 2026-10-10 Priority changed: LOW → MEDIUM

References

Other 1

Sources

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