# CVE-2026-73537: Cross-site scripting in Miraikan Assist App Android version

> Attackers can execute arbitrary scripts in the app's WebView, altering displayed content for users of the Miraikan Assist App.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA: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:** No
- **Published:** 21 Aug 2026
- **Updated:** 21 Aug 2026
- **Also known as:** GHSA-599w-xgxp-wr28

## What is CVE-2026-73537?

CVE-2026-73537 is a medium-severity cross-site scripting vulnerability in Japan Science and Technology Agency (JST) Miraikan Assist App Android version, published on 21 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

Cross-site scripting vulnerability exists in Miraikan Assist App. If this vulnerability is exploited, an arbitrary script may be executed in the browser component (WebView) running on the affected product, resulting in the displayed content being altered.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-73537?


## How do I fix CVE-2026-73537?

No fix has been published for CVE-2026-73537 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73537 being exploited?

There is no known exploitation of CVE-2026-73537 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73537 and fix it if it is affected.

What it is: CVE-2026-73537 is a medium-severity cross-site scripting vulnerability in Japan Science and Technology Agency (JST) Miraikan Assist App Android version, published on 21 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-2026-73537 in the wild and no public exploit code.

Affected product: Japan Science and Technology Agency (JST) Miraikan Assist App Android version. 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-2026-73537/ (Markdown: https://insights.sbomify.com/CVE-2026-73537/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73537
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73537
- OSV: https://osv.dev/vulnerability/CVE-2026-73537

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-73537/
Summaries are generated and may contain mistakes; the official description above is the record.