Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Microsoft.WindowsDesktop.App.Runtime packages for win-x64, win-x86 and win-arm64 are affected in .NET 6.0 up to 6.0.28, .NET 7.0 up to 7.0.17, and .NET 8.0 up to 8.0.3. A use-after-free flaw in WPF may allow elevation of privilege when a user views an untrusted document, and the source describes it as affecting only WPF-based applications on Windows. Upgrade to 6.0.29, 7.0.18 or 8.0.4 or later, then restart applications; self-contained applications must be recompiled and redeployed.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.3 | High | 3.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C | CNA (microsoft) |
- CISA KEV Not listed.
- EPSS 0.025, the 84th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:22 UTC First seen by agentprime
- 31 Oct 2026, 15:22 UTC Confirmed by OSV