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Vulnerability record · CVE-2021-25827 · published 28 June 2023

CVE-2021-25827: Emby authentication bypass by spoofing vulnerability

Emby · Emby

Emby Server < 4.7.12.0 is vulnerable to a login bypass attack by setting the X-Forwarded-For header to a local IP-address.

9.8 CVSS 3.1 Critical EPSS 1.5% · top 26.8% CWE-290 · Authentication bypass by spoofing
9.8CVSS 3.1 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Emby Server < 4.7.12.0 is vulnerable to a login bypass attack by setting the X-Forwarded-For header to a local IP-address.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://emby.media/community/index.php?/topic/98191-emby-server-46-released/ Product
https://github.com/EmbySupport/security/security/advisories/GHSA-fffj-6fr6-3fgf Not Applicable
https://github.com/MediaBrowser/Emby/issues/3784 ExploitIssue TrackingThird Party Advisory
https://emby.media/community/index.php?/topic/98191-emby-server-46-released/ Product
https://github.com/EmbySupport/security/security/advisories/GHSA-fffj-6fr6-3fgf Not Applicable
https://github.com/MediaBrowser/Emby/issues/3784 ExploitIssue TrackingThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-25827), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.