# CVE-2026-70331: Microsoft Edge for iOS Spoofing Vulnerability

> An attacker can spoof content in Microsoft Edge for iOS via improper input neutralization in LLM prompting, requiring a patch.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 28 Aug 2026
- **Updated:** 28 Oct 2026
- **Also known as:** GHSA-wjm5-2899-cw52

## What is CVE-2026-70331?

CVE-2026-70331 is a medium-severity vulnerability in Microsoft Edge, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Improper neutralization of input used for llm prompting in Microsoft Edge for iOS allows an unauthorized attacker to perform spoofing over a network.

Weakness: CWE-1427 (Improper Neutralization of Input Used for LLM Prompting)

## Which versions are affected by CVE-2026-70331?

It affects 2 products.


Products: Microsoft Edge, Microsoft Edge Chromium.

## How do I fix CVE-2026-70331?

No fix has been published for CVE-2026-70331 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-70331 being exploited?

There is no known exploitation of CVE-2026-70331 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-2026-70331 and fix it if it is affected.

What it is: CVE-2026-70331 is a medium-severity vulnerability in Microsoft Edge, published on 28 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-70331 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-2026-70331/ (Markdown: https://insights.sbomify.com/CVE-2026-70331/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-70331
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-70331
- OSV: https://osv.dev/vulnerability/CVE-2026-70331

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-70331/
Summaries are generated and may contain mistakes; the official description above is the record.