# CVE-2016-5133: Auth bypass in n/a

> Man-in-the-middle attackers can spoof proxy login prompts or store incorrect credentials by manipulating origin information during authentication.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:H/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:** 23 Jul 2016
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-95wh-v6qf-2wcw, UBUNTU-CVE-2016-5133

## What is CVE-2016-5133?

CVE-2016-5133 is a medium-severity authentication bypass vulnerability in Google Chrome, published on 23 Jul 2016. 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

Google Chrome before 52.0.2743.82 mishandles origin information during proxy authentication, which allows man-in-the-middle attackers to spoof a proxy-authentication login prompt or trigger incorrect credential storage by modifying the client-server data stream.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2016-5133?

It affects 1 product.


Products: Google Chrome.

## How do I fix CVE-2016-5133?

Upgrade to a fixed version.

## Is CVE-2016-5133 being exploited?

There is no known exploitation of CVE-2016-5133 in the wild and no public exploit code.

## Other vulnerabilities in Google Chrome

- [CVE-2022-4135](https://insights.sbomify.com/CVE-2022-4135/): Google Chromium GPU Heap Buffer Overflow (critical 9.6, exploited in the wild)
- [CVE-2020-16017](https://insights.sbomify.com/CVE-2020-16017/): Google Chrome Use-After-Free (critical 9.6, exploited in the wild)
- [CVE-2020-16010](https://insights.sbomify.com/CVE-2020-16010/): Google Chrome for Android UI Heap Buffer Overflow (critical 9.6, exploited in the wild)
- [CVE-2026-87491](https://insights.sbomify.com/CVE-2026-87491/): Google Chromium V8 Out of Bounds Write (high 8.8, exploited in the wild)
- [CVE-2026-85046](https://insights.sbomify.com/CVE-2026-85046/): Google Chromium V8 Type Confusion (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-5133 and fix it if it is affected.

What it is: CVE-2016-5133 is a medium-severity authentication bypass vulnerability in Google Chrome, published on 23 Jul 2016. 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-2016-5133 in the wild and no public exploit code.

Affected product: Google Chrome. 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-2016-5133/ (Markdown: https://insights.sbomify.com/CVE-2016-5133/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-5133
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-5133
- OSV: https://osv.dev/vulnerability/CVE-2016-5133

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-5133/
Summaries are generated and may contain mistakes; the official description above is the record.