# CVE-2016-4027: Information disclosure in n/a

> Attackers on shared clients can access user accounts due to improper cookie storage during non-interactive logins, exposing authentication data.

- **Severity:** Low 3.5 (`CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Dec 2016
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-r9q8-r7xg-vx6c

## What is CVE-2016-4027?

CVE-2016-4027 is a low-severity vulnerability in Open-Xchange Open-Xchange Appsuite, published on 15 Dec 2016. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

An issue was discovered in Open-Xchange OX App Suite before 7.8.1-rev10. App Suite frontend offers to control whether a user wants to store cookies that exceed the session duration. This functionality is useful when logging in from clients with reduced privileges or shared environments. However the setting was incorrectly recognized and cookies were stored regardless of this setting when the login was performed using a non-interactive login method. In case the setting was enforced by middleware configuration or the user went through the interactive login page, the workflow was correct. Cookies with authentication information may become available to other users on shared environments. In case the user did not properly log out from the session, third parties with access to the same client can access a user's account.

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

## Which versions are affected by CVE-2016-4027?

It affects 1 product.


Products: Open-Xchange Open-Xchange Appsuite.

## How do I fix CVE-2016-4027?

No fix has been published for CVE-2016-4027 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-4027 being exploited?

There is no known exploitation of CVE-2016-4027 in the wild and no public exploit code.

## Other vulnerabilities in Open-Xchange Open-Xchange Appsuite

- [CVE-2017-13667](https://insights.sbomify.com/CVE-2017-13667/): Server-side request forgery in n/a (critical 9.9)
- [CVE-2020-12645](https://insights.sbomify.com/CVE-2020-12645/): Denial of service in n/a (critical 9.8)
- [CVE-2019-7158](https://insights.sbomify.com/CVE-2019-7158/): Missing authorization in n/a (critical 9.8)
- [CVE-2017-17060](https://insights.sbomify.com/CVE-2017-17060/): Misconfiguration in n/a (critical 9.8)
- [CVE-2017-5210](https://insights.sbomify.com/CVE-2017-5210/): Information disclosure in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-4027 and fix it if it is affected.

What it is: CVE-2016-4027 is a low-severity vulnerability in Open-Xchange Open-Xchange Appsuite, published on 15 Dec 2016. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2016-4027 in the wild and no public exploit code.

Affected product: Open-Xchange Open-Xchange Appsuite. 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-2016-4027/ (Markdown: https://insights.sbomify.com/CVE-2016-4027/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-4027
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-4027
- OSV: https://osv.dev/vulnerability/CVE-2016-4027

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-4027/
Summaries are generated and may contain mistakes; the official description above is the record.