# CVE-2020-15177: Unauthenticated Stored XSS in GLPI

> Unauthenticated attackers can inject malicious scripts via installation settings, leading to session hijacking or data theft in GLPI.

- **Severity:** High 8.0 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/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:** No
- **Published:** 7 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-prvh-9m4h-4m79, UBUNTU-CVE-2020-15177

## What is CVE-2020-15177?

CVE-2020-15177 is a high-severity cross-site scripting vulnerability in Glpi-Project Glpi, published on 7 Oct 2020. 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

In GLPI before version 9.5.2, the `install/install.php` endpoint insecurely stores user input into the database as `url_base` and `url_base_api`. These settings are referenced throughout the application and allow for vulnerabilities like Cross-Site Scripting and Insecure Redirection Since authentication is not required to perform these changes,anyone could point these fields at malicious websites or form input in a way to trigger XSS. Leveraging JavaScript it's possible to steal cookies, perform actions as the user, etc. The issue is patched in version 9.5.2.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2020-15177?

It affects 1 product.


Products: Glpi-Project Glpi.

## How do I fix CVE-2020-15177?

No fix has been published for CVE-2020-15177 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-15177 being exploited?

There is no known exploitation of CVE-2020-15177 in the wild and no public exploit code.

## Other vulnerabilities in Glpi-Project Glpi

- [CVE-2022-35914](https://insights.sbomify.com/CVE-2022-35914/): Teclib GLPI Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2023-42802](https://insights.sbomify.com/CVE-2023-42802/): GLPI vulnerable to unallowed PHP script execution (critical 10.0)
- [CVE-2023-28849](https://insights.sbomify.com/CVE-2023-28849/): GLPI vulnerable to SQL injection and Stored XSS via inventory agent request (critical 10.0)
- [CVE-2022-35947](https://insights.sbomify.com/CVE-2022-35947/): SQL injection in GLPI (critical 10.0)
- [CVE-2022-31056](https://insights.sbomify.com/CVE-2022-31056/): SQL injection with _actor parameter in GLPI (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-15177 and fix it if it is affected.

What it is: CVE-2020-15177 is a high-severity cross-site scripting vulnerability in Glpi-Project Glpi, published on 7 Oct 2020. 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-2020-15177 in the wild and no public exploit code.

Affected product: Glpi-Project Glpi. 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-2020-15177/ (Markdown: https://insights.sbomify.com/CVE-2020-15177/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-15177
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-15177
- OSV: https://osv.dev/vulnerability/CVE-2020-15177

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-15177/
Summaries are generated and may contain mistakes; the official description above is the record.