# CVE-2019-11765: Security feature bypass in Firefox

> A compromised content process can trick the parent process into granting attacker-controlled permissions instead of Click to Play, bypassing security prompts.

- **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:** 8 Jan 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-54vc-64p7-55q5, UBUNTU-CVE-2019-11765

## What is CVE-2019-11765?

CVE-2019-11765 is a medium-severity vulnerability in Mozilla Firefox, published on 8 Jan 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

A compromised content process could send a message to the parent process that would cause the 'Click to Play' permission prompt to be shown. However, due to lack of validation from the parent process, if the user accepted the permission request an attacker-controlled permission would be granted rather than the 'Click to Play' permission. This vulnerability affects Firefox < 70.

Weakness: CWE-276 (Incorrect Default Permissions)

## Which versions are affected by CVE-2019-11765?

It affects 1 product.


Products: Mozilla Firefox.

## How do I fix CVE-2019-11765?

Upgrade to a fixed version.

## Is CVE-2019-11765 being exploited?

There is no known exploitation of CVE-2019-11765 in the wild and no public exploit code.

## Other vulnerabilities in Mozilla Firefox

- [CVE-2019-11708](https://insights.sbomify.com/CVE-2019-11708/): Mozilla Firefox and Thunderbird Sandbox Escape (critical 10.0, exploited in the wild)
- [CVE-2010-3765](https://insights.sbomify.com/CVE-2010-3765/): Mozilla Multiple Products Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2022-26486](https://insights.sbomify.com/CVE-2022-26486/): Mozilla Firefox Use-After-Free (critical 9.6, exploited in the wild)
- [CVE-2022-26485](https://insights.sbomify.com/CVE-2022-26485/): Mozilla Firefox Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2019-11707](https://insights.sbomify.com/CVE-2019-11707/): Mozilla Firefox and Thunderbird Type Confusion (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-11765 and fix it if it is affected.

What it is: CVE-2019-11765 is a medium-severity vulnerability in Mozilla Firefox, published on 8 Jan 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-2019-11765 in the wild and no public exploit code.

Affected product: Mozilla Firefox. 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-2019-11765/ (Markdown: https://insights.sbomify.com/CVE-2019-11765/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-11765
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-11765
- OSV: https://osv.dev/vulnerability/CVE-2019-11765

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-11765/
Summaries are generated and may contain mistakes; the official description above is the record.