# CVE-2016-0721: Other in n/a

> Attackers can hijack user sessions in the Pacemaker cluster manager's web interface, potentially gaining unauthorized access to cluster management functions.

- **Severity:** High 8.1 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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:** 21 Apr 2017
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2016-0721, GHSA-25mh-8263-4259

## What is CVE-2016-0721?

CVE-2016-0721 is a high-severity vulnerability in Fedoraproject Fedora, published on 21 Apr 2017. 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

Session fixation vulnerability in pcsd in pcs before 0.9.157.

Weakness: CWE-384 (Session Fixation)

## Which versions are affected by CVE-2016-0721?

It affects 3 products.


Products: Clusterlabs Pcs, Fedoraproject Fedora, Redhat Enterprise Linux.

## How do I fix CVE-2016-0721?

Upgrade to a fixed version.

## Is CVE-2016-0721 being exploited?

There is no known exploitation of CVE-2016-0721 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2023-2319](https://insights.sbomify.com/CVE-2023-2319/): It was discovered that an update for PCS package in RHBA-2023:2151 erratum released as part of Red Hat Enterprise Linux 9.2 failed to includ (critical 9.8)
- [CVE-2022-1049](https://insights.sbomify.com/CVE-2022-1049/): Auth bypass in clusterlabs/pcs (high 8.8)
- [CVE-2016-0720](https://insights.sbomify.com/CVE-2016-0720/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2022-2735](https://insights.sbomify.com/CVE-2022-2735/): Privilege escalation in ClusterLabs/pcs (high 7.8)
- [CVE-2017-2661](https://insights.sbomify.com/CVE-2017-2661/): Cross-site scripting in pcs (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-0721 and fix it if it is affected.

What it is: CVE-2016-0721 is a high-severity vulnerability in Fedoraproject Fedora, published on 21 Apr 2017. 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-2016-0721 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2016-0721/ (Markdown: https://insights.sbomify.com/CVE-2016-0721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-0721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-0721
- OSV: https://osv.dev/vulnerability/CVE-2016-0721

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-0721/
Summaries are generated and may contain mistakes; the official description above is the record.