# CVE-2016-4926: Auth bypass in n/a

> Remote attackers can perform administrative tasks without authentication on Junos Space, requiring an upgrade to secure the network management interface.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Mar 2017
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-cg68-rv98-xxqj

## What is CVE-2016-4926?

CVE-2016-4926 is a critical authentication bypass vulnerability in Juniper Junos Space, published on 20 Mar 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Insufficient authentication vulnerability in Junos Space before 15.2R2 allows remote network based users with access to Junos Space web interface to perform certain administrative tasks without authentication.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2016-4926?

It affects 1 product.


Products: Juniper Junos Space.

## How do I fix CVE-2016-4926?

No fix has been published for CVE-2016-4926 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-4926 being exploited?

There is no known exploitation of CVE-2016-4926 in the wild and no public exploit code.

## Other vulnerabilities in Juniper Junos Space

- [CVE-2014-3412](https://insights.sbomify.com/CVE-2014-3412/): Command injection in n/a (critical 10.0)
- [CVE-2014-3413](https://insights.sbomify.com/CVE-2014-3413/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2016-1265](https://insights.sbomify.com/CVE-2016-1265/): Junos Space: privilege escalation vulnerabilities in Junos Space (critical 9.8)
- [CVE-2017-10622](https://insights.sbomify.com/CVE-2017-10622/): Junos Space: Authentication bypass vulnerability (critical 9.8)
- [CVE-2025-59978](https://insights.sbomify.com/CVE-2025-59978/): Junos Space: Stored cross-site scripting vulnerability in web application (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-4926 and fix it if it is affected.

What it is: CVE-2016-4926 is a critical authentication bypass vulnerability in Juniper Junos Space, published on 20 Mar 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2016-4926 in the wild and no public exploit code.

Affected product: Juniper Junos Space. 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-2016-4926/ (Markdown: https://insights.sbomify.com/CVE-2016-4926/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-4926
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-4926
- OSV: https://osv.dev/vulnerability/CVE-2016-4926

---
From sbomify Insights: https://insights.sbomify.com/CVE-2016-4926/
Summaries are generated and may contain mistakes; the official description above is the record.