# CVE-2026-50521: Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

> An authorized attacker can execute arbitrary code remotely via a use-after-free flaw in Microsoft Edge.

- **Severity:** High 8.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L/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:** 1 Jul 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-q4g4-rw2v-x4v7

## What is CVE-2026-50521?

CVE-2026-50521 is a high-severity use after free vulnerability in Microsoft Edge Chromium, published on 1 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Use after free in Microsoft Edge (Chromium-based) allows an authorized attacker to execute code over a network.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2026-50521?

It affects 1 product.


Products: Microsoft Edge Chromium.

## How do I fix CVE-2026-50521?

No fix has been published for CVE-2026-50521 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-50521 being exploited?

There is no known exploitation of CVE-2026-50521 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Edge Chromium

- [CVE-2024-21326](https://insights.sbomify.com/CVE-2024-21326/): Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability (critical 9.6)
- [CVE-2023-35618](https://insights.sbomify.com/CVE-2023-35618/): Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability (critical 9.6)
- [CVE-2023-36735](https://insights.sbomify.com/CVE-2023-36735/): Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability (critical 9.6)
- [CVE-2022-33649](https://insights.sbomify.com/CVE-2022-33649/): Microsoft Edge (Chromium-based) Security Feature Bypass Vulnerability (critical 9.6)
- [CVE-2026-58289](https://insights.sbomify.com/CVE-2026-58289/): Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-50521 and fix it if it is affected.

What it is: CVE-2026-50521 is a high-severity use after free vulnerability in Microsoft Edge Chromium, published on 1 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-50521 in the wild and no public exploit code.

Affected product: Microsoft Edge Chromium. 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-2026-50521/ (Markdown: https://insights.sbomify.com/CVE-2026-50521/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-50521
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-50521
- OSV: https://osv.dev/vulnerability/CVE-2026-50521

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-50521/
Summaries are generated and may contain mistakes; the official description above is the record.