CefSharp affected by incorrect handle provided in unspecified circumstances in Mojo on Windows

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.3 · CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Incorrect handle provided in unspecified circumstances in Mojo in Google Chrome on Windows prior to 134.0.6998.177 allowed a remote attacker to perform a sandbox escape via a malicious file. (Chromium security severity: High) https://nvd.nist.gov/vuln/detail/CVE-2025-2783 https://chromereleases.googleblog.com/2025/03/stable-channel-update-for-desktop25.html https://issues.chromium.org/issues/405143032

Published by the source

12 Apr 2025, 03:43 UTC

Last modified by the source

12 Apr 2025, 03:43 UTC

Source last checked

26 Oct 2026, 17:03 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-f87w-3j5w-v58p

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# Patch Next advisory brief: GHSA-f87w-3j5w-v58p

Advisory: CefSharp affected by incorrect handle provided in unspecified circumstances in Mojo on Windows
IDs: GHSA-f87w-3j5w-v58p
Record: https://patchnext.com/advisories/ghsa-f87w-3j5w-v58p (revision 1, source checked 26 Oct 2026, 17:03 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: cefsharp.wpf.hwndhost 134.3.90; cefsharp.wpf.netcore 134.3.90; cefsharp.wpf 134.3.90; cefsharp.winforms.netcore 134.3.90; cefsharp.offscreen 134.3.90; cefsharp.winforms 134.3.90; cefsharp.offscreen.netcore 134.3.90. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet cefsharp.wpf.hwndhost: affected < 134.3.90; fixed in 134.3.90
- NuGet cefsharp.wpf.netcore: affected < 134.3.90; fixed in 134.3.90
- NuGet cefsharp.wpf: affected < 134.3.90; fixed in 134.3.90
- NuGet cefsharp.winforms.netcore: affected < 134.3.90; fixed in 134.3.90
- NuGet cefsharp.offscreen: affected < 134.3.90; fixed in 134.3.90
- NuGet cefsharp.winforms: affected < 134.3.90; fixed in 134.3.90
- NuGet cefsharp.offscreen.netcore: affected < 134.3.90; fixed in 134.3.90

## Suggested inspection (read-only)
- NuGet cefsharp.wpf.hwndhost: check the installed version with your package manager.
- NuGet cefsharp.wpf.netcore: check the installed version with your package manager.
- NuGet cefsharp.wpf: check the installed version with your package manager.
- NuGet cefsharp.winforms.netcore: check the installed version with your package manager.
- NuGet cefsharp.offscreen: check the installed version with your package manager.
- NuGet cefsharp.winforms: check the installed version with your package manager.
- NuGet cefsharp.offscreen.netcore: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on cefsharp.wpf.hwndhost, cefsharp.wpf.netcore, cefsharp.wpf, cefsharp.winforms.netcore, cefsharp.offscreen, cefsharp.winforms, cefsharp.offscreen.netcore.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-f87w-3j5w-v58p (GitHub-reviewed advisory GHSA-f87w-3j5w-v58p lists affected ranges: NuGet cefsharp.wpf >=0 =0 =0 =0 =0 =0 =0 <134.3.90)

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