# CVE-2026-66310: Microsoft Edge for Android Information Disclosure Vulnerability

> An attacker can disclose local information via external control of file names or paths in Microsoft Edge for Android.

- **Severity:** High 7.7 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Aug 2026
- **Updated:** 28 Oct 2026
- **Also known as:** GHSA-78fm-87r7-5p5x

## What is CVE-2026-66310?

CVE-2026-66310 is a high-severity vulnerability in Microsoft Edge, published on 3 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

External control of file name or path in Microsoft Edge for Android allows an unauthorized attacker to disclose information locally.

Weakness: CWE-73 (External Control of File Name or Path)

## Which versions are affected by CVE-2026-66310?

It affects 1 product.


Products: Microsoft Edge.

## How do I fix CVE-2026-66310?

No fix has been published for CVE-2026-66310 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-66310 being exploited?

There is no known exploitation of CVE-2026-66310 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Edge

- [CVE-2021-26411](https://insights.sbomify.com/CVE-2021-26411/): Microsoft Internet Explorer Memory Corruption (high 8.8, exploited in the wild)
- [CVE-2016-7200](https://insights.sbomify.com/CVE-2016-7200/): Microsoft Edge Memory Corruption (high 8.8, exploited in the wild)
- [CVE-2016-7201](https://insights.sbomify.com/CVE-2016-7201/): Microsoft Edge Memory Corruption (high 8.8, exploited in the wild)
- [CVE-2017-0037](https://insights.sbomify.com/CVE-2017-0037/): Microsoft Edge and Internet Explorer Type Confusion (high 8.1, exploited in the wild)
- [CVE-2016-3351](https://insights.sbomify.com/CVE-2016-3351/): Microsoft Internet Explorer and Edge Information Disclosure (medium 6.5, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-66310 and fix it if it is affected.

What it is: CVE-2026-66310 is a high-severity vulnerability in Microsoft Edge, published on 3 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-66310 in the wild and no public exploit code.

Affected product: Microsoft Edge. 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-2026-66310/ (Markdown: https://insights.sbomify.com/CVE-2026-66310/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-66310
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66310
- OSV: https://osv.dev/vulnerability/CVE-2026-66310

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-66310/
Summaries are generated and may contain mistakes; the official description above is the record.