# CVE-2025-26651: Windows Local Session Manager (LSM) Denial of Service Vulnerability

> An authorized attacker can cause a denial of service in Windows Local Session Manager via an exposed dangerous method.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Apr 2025
- **Updated:** 10 Aug 2026
- **Also known as:** GHSA-47qr-4ffm-5qm9

## What is CVE-2025-26651?

CVE-2025-26651 is a medium-severity denial of service vulnerability in Microsoft Windows 11 22h2, published on 8 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Exposed dangerous method or function in Windows Local Session Manager (LSM) allows an authorized attacker to deny service over a network.

Weakness: CWE-749 (Exposed Dangerous Method or Function)

## Which versions are affected by CVE-2025-26651?

It affects 6 products.


Products: Microsoft Windows 11 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23h2, Microsoft Windows Server 2025.

## How do I fix CVE-2025-26651?

No fix has been published for CVE-2025-26651 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-26651 being exploited?

There is no known exploitation of CVE-2025-26651 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Windows 11 22h2

- [CVE-2024-49117](https://insights.sbomify.com/CVE-2024-49117/): Windows Hyper-V Remote Code Execution Vulnerability (high 8.8)
- [CVE-2024-21435](https://insights.sbomify.com/CVE-2024-21435/): Windows OLE Remote Code Execution Vulnerability (high 8.8)
- [CVE-2025-24084](https://insights.sbomify.com/CVE-2025-24084/): Windows Subsystem for Linux (WSL2) Kernel Remote Code Execution Vulnerability (high 8.4)
- [CVE-2025-33054](https://insights.sbomify.com/CVE-2025-33054/): Remote Desktop Spoofing Vulnerability (high 8.1)
- [CVE-2025-29828](https://insights.sbomify.com/CVE-2025-29828/): Windows Schannel Remote Code Execution Vulnerability (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-26651 and fix it if it is affected.

What it is: CVE-2025-26651 is a medium-severity denial of service vulnerability in Microsoft Windows 11 22h2, published on 8 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-26651 in the wild and no public exploit code.

Affected product: Microsoft Windows 11 22h2. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-26651/ (Markdown: https://insights.sbomify.com/CVE-2025-26651/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-26651
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-26651
- OSV: https://osv.dev/vulnerability/CVE-2025-26651

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-26651/
Summaries are generated and may contain mistakes; the official description above is the record.