# CVE-2022-31746: Information disclosure in Firefox for iOS

> Attackers can leak internal secret UUID keys via the Referrer header, exposing protected internal URLs in Firefox for iOS.

- **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:** No
- **Published:** 22 Dec 2022
- **Updated:** 15 Apr 2025
- **Also known as:** GHSA-5mgf-9mwf-m64w

## What is CVE-2022-31746?

CVE-2022-31746 is a medium-severity vulnerability in Mozilla Firefox Mobile, published on 22 Dec 2022. 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

Internal URLs are protected by a secret UUID key, which could have been leaked to web page through the Referrer header. This vulnerability affects Firefox for iOS < 102.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2022-31746?

It affects 1 product.


Products: Mozilla Firefox Mobile.

## How do I fix CVE-2022-31746?

No fix has been published for CVE-2022-31746 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-31746 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-31746 exists.

## Other vulnerabilities in Mozilla Firefox Mobile

- [CVE-2026-84135](https://insights.sbomify.com/CVE-2026-84135/): Other issue in Firefox Focus for Android (critical 9.8)
- [CVE-2024-43111](https://insights.sbomify.com/CVE-2024-43111/): Cross-site scripting in Firefox for iOS (critical 9.8)
- [CVE-2023-49060](https://insights.sbomify.com/CVE-2023-49060/): Information disclosure in Firefox for iOS (critical 9.8)
- [CVE-2026-92033](https://insights.sbomify.com/CVE-2026-92033/): Privilege escalation in Firefox for Android (high 8.8)
- [CVE-2026-84117](https://insights.sbomify.com/CVE-2026-84117/): Privilege escalation in Firefox for Android (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-31746 and fix it if it is affected.

What it is: CVE-2022-31746 is a medium-severity vulnerability in Mozilla Firefox Mobile, published on 22 Dec 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-31746 exists.

Affected product: Mozilla Firefox Mobile. 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-2022-31746/ (Markdown: https://insights.sbomify.com/CVE-2022-31746/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-31746
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-31746
- OSV: https://osv.dev/vulnerability/CVE-2022-31746

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-31746/
Summaries are generated and may contain mistakes; the official description above is the record.