# CVE-2020-6506: Android WebView Universal Cross-site Scripting

> Remote attackers can bypass site isolation in Chrome Android WebView via crafted HTML, compromising security boundaries.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N`)
- **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:** Yes
- **Published:** 22 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-6506, GHSA-36j3-xxf7-4pqg, UBUNTU-CVE-2020-6506

## What is CVE-2020-6506?

CVE-2020-6506 is a medium-severity vulnerability in Google Chrome, published on 22 Jul 2020. 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

Insufficient policy enforcement in WebView in Google Chrome on Android prior to 83.0.4103.106 allowed a remote attacker to bypass site isolation via a crafted HTML page.

## Which versions are affected by CVE-2020-6506?

2 open source packages ship an affected version, including react-native-webview. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `react-native-webview` | npm | All versions | 11.0.0 |
| `react-native-webview` | npm | All versions | 11.0.0 |

Products: Google Chrome.

## How do I fix CVE-2020-6506?

Upgrade react-native-webview to 11.0.0 or later.

## Is CVE-2020-6506 being exploited?

There is no known exploitation of CVE-2020-6506 in the wild and no public exploit code.

## Other vulnerabilities in Google Chrome

- [CVE-2022-4135](https://insights.sbomify.com/CVE-2022-4135/): Google Chromium GPU Heap Buffer Overflow (critical 9.6, exploited in the wild)
- [CVE-2020-16017](https://insights.sbomify.com/CVE-2020-16017/): Google Chrome Use-After-Free (critical 9.6, exploited in the wild)
- [CVE-2020-16010](https://insights.sbomify.com/CVE-2020-16010/): Google Chrome for Android UI Heap Buffer Overflow (critical 9.6, exploited in the wild)
- [CVE-2026-87491](https://insights.sbomify.com/CVE-2026-87491/): Google Chromium V8 Out of Bounds Write (high 8.8, exploited in the wild)
- [CVE-2026-85046](https://insights.sbomify.com/CVE-2026-85046/): Google Chromium V8 Type Confusion (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-6506 and fix it if it is affected.

What it is: CVE-2020-6506 is a medium-severity vulnerability in Google Chrome, published on 22 Jul 2020. 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-2020-6506 in the wild and no public exploit code.

Affected packages and fixed versions:
- react-native-webview (npm): affected all versions; fixed in 11.0.0
- react-native-webview (npm): affected all versions; fixed in 11.0.0

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-2020-6506/ (Markdown: https://insights.sbomify.com/CVE-2020-6506/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-6506
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-6506
- OSV: https://osv.dev/vulnerability/CVE-2020-6506

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-6506/
Summaries are generated and may contain mistakes; the official description above is the record.