# CVE-2020-8253: Auth bypass in Citrix XenMobile Server

> Improper authentication in Citrix XenMobile Server allows attackers to access sensitive files without proper credentials.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Sep 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-mgp8-hj77-63qg

## What is CVE-2020-8253?

CVE-2020-8253 is a high-severity authentication bypass vulnerability in Citrix XenMobile Server, published on 18 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper authentication in Citrix XenMobile Server 10.12 before RP2, Citrix XenMobile Server 10.11 before RP4, Citrix XenMobile Server 10.10 before RP6 and Citrix XenMobile Server before 10.9 RP5 leads to the ability to access sensitive files.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2020-8253?

It affects 1 product.


Products: Citrix Xenmobile Server.

## How do I fix CVE-2020-8253?

No fix has been published for CVE-2020-8253 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-8253 being exploited?

There is no known exploitation of CVE-2020-8253 in the wild and no public exploit code.

## Other vulnerabilities in Citrix XenMobile Server

- [CVE-2020-8211](https://insights.sbomify.com/CVE-2020-8211/): SQL injection in Citrix XenMobile Server (critical 9.8)
- [CVE-2020-8212](https://insights.sbomify.com/CVE-2020-8212/): Missing authorization in Citrix XenMobile Server (critical 9.8)
- [CVE-2018-10648](https://insights.sbomify.com/CVE-2018-10648/): File upload in n/a (critical 9.8)
- [CVE-2018-10653](https://insights.sbomify.com/CVE-2018-10653/): XML external entity in n/a (critical 9.8)
- [CVE-2018-18571](https://insights.sbomify.com/CVE-2018-18571/): Auth bypass in n/a (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-8253 and fix it if it is affected.

What it is: CVE-2020-8253 is a high-severity authentication bypass vulnerability in Citrix XenMobile Server, published on 18 Sep 2020. 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-2020-8253 in the wild and no public exploit code.

Affected product: Citrix XenMobile Server. 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-2020-8253/ (Markdown: https://insights.sbomify.com/CVE-2020-8253/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-8253
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-8253
- OSV: https://osv.dev/vulnerability/CVE-2020-8253

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-8253/
Summaries are generated and may contain mistakes; the official description above is the record.