CVE-2023-33193Known exploitationNetwork attack vector

Administrative access via spoofed proxy headers

Published May 30, 2023 · Updated Jan 10, 2025

Authentication bypass in Emby Server before 4.7.12 and beta before 4.8.0.31 allows remote attackers to gain administrative access. The server trusts spoofable reverse-proxy headers when classifying a remote request as local, weakening login rules and exposing public user listings. Exploitation requires a publicly accessible server and an administrative account configured for passwordless local-network sign-in or an empty password.

CVSS severity9.1
Critical
EPSS probability1.70%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Emby Server before 4.7.12 and beta before 4.8.0.31 allows remote attackers to gain administrative access. The server trusts spoofable reverse-proxy headers when classifying a remote request as local, weakening login rules and exposing public user listings. Exploitation requires a publicly accessible server and an administrative account configured for passwordless local-network sign-in or an empty password.

The record

CVE
CVE-2023-33193
Published
May 30, 2023
Updated
Jan 10, 2025
Vendor
Media Browser
Product
Emby Server
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 10, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.7.12
  2. Affected versionversion=< 4.8.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Media Browser · Emby Serverversion=< 4.7.12; version=< 4.8.31

Published CVSS scores

9.1NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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