# CVE-2020-15649: File upload in Firefox ESR

> A malicious file picker app could steal and upload arbitrary local files on Firefox for Android, bypassing user selection.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 10 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-wg7m-wv28-cvcr

## What is CVE-2020-15649?

CVE-2020-15649 is a medium-severity vulnerability in Mozilla Firefox Esr, published on 10 Aug 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

Given an installed malicious file picker application, an attacker was able to steal and upload local files of their choosing, regardless of the actually files picked. *Note: This issue only affected Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 68.11.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2020-15649?

It affects 1 product.


Products: Mozilla Firefox Esr.

## How do I fix CVE-2020-15649?

No fix has been published for CVE-2020-15649 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-15649 being exploited?

There is no known exploitation of CVE-2020-15649 in the wild and no public exploit code.

## Other vulnerabilities in Mozilla Firefox Esr

- [CVE-2021-4127](https://insights.sbomify.com/CVE-2021-4127/): Other in Firefox ESR (critical 9.8)
- [CVE-2023-25746](https://insights.sbomify.com/CVE-2023-25746/): Memory corruption in Firefox ESR (high 8.8)
- [CVE-2021-38495](https://insights.sbomify.com/CVE-2021-38495/): Memory corruption in Firefox ESR (high 8.8)
- [CVE-2020-15669](https://insights.sbomify.com/CVE-2020-15669/): Use after free in Firefox ESR (high 8.8)
- [CVE-2022-38476](https://insights.sbomify.com/CVE-2022-38476/): Use after free in Firefox ESR (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-15649 and fix it if it is affected.

What it is: CVE-2020-15649 is a medium-severity vulnerability in Mozilla Firefox Esr, published on 10 Aug 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-15649 in the wild and no public exploit code.

Affected product: Mozilla Firefox Esr. 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-2020-15649/ (Markdown: https://insights.sbomify.com/CVE-2020-15649/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-15649
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-15649
- OSV: https://osv.dev/vulnerability/CVE-2020-15649

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-15649/
Summaries are generated and may contain mistakes; the official description above is the record.