# CVE-2023-34415: Open redirect in Firefox

> Firefox failed to isolate processes for data URLs resulting from redirects, bypassing site isolation protections against Spectre-like attacks.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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:** 19 Jun 2023
- **Updated:** 13 Feb 2025
- **Also known as:** GHSA-7wmp-qghr-8g7f, UBUNTU-CVE-2023-34415

## What is CVE-2023-34415?

CVE-2023-34415 is a medium-severity vulnerability in Mozilla Firefox, published on 19 Jun 2023. 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

When choosing a site-isolated process for a document loaded from a data: URL that was the result of a redirect, Firefox would load that document in the same process as the site that issued the redirect. This bypassed the site-isolation protections against Spectre-like attacks on sites that host an "open redirect". Firefox no longer follows HTTP redirects to data: URLs. This vulnerability affects Firefox < 114.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2023-34415?

It affects 1 product.


Products: Mozilla Firefox.

## How do I fix CVE-2023-34415?

Upgrade to a fixed version.

## Is CVE-2023-34415 being exploited?

There is no known exploitation of CVE-2023-34415 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-2023-34415 and fix it if it is affected.

What it is: CVE-2023-34415 is a medium-severity vulnerability in Mozilla Firefox, published on 19 Jun 2023. 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-2023-34415 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-2023-34415/ (Markdown: https://insights.sbomify.com/CVE-2023-34415/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-34415
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-34415
- OSV: https://osv.dev/vulnerability/CVE-2023-34415

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-34415/
Summaries are generated and may contain mistakes; the official description above is the record.