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TI-2021-07880 Aliases CVE-2021-25827GHSA-m4q9-68f2-5wc6

Emby Server < 4.7.12.0 is vulnerable to a login bypass attack by setting the…

Priority HIGH 82CWE-290Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-290.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01497 74th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:emby:emby:*:*:*:*:*:*:*:*before 4.7.12.0VulnerableEmby
  • cpe:2.3:a:emby:emby:*:*:*:*:*:*:*:* Versions before 4.7.12.0 Vulnerable ·Emby

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-25827
  2. 2026-10-03 Alias added: GHSA-m4q9-68f2-5wc6

References

Exploit 1

Other 2

  • TI-2020-16372 Emby Server before 4.5.0 allows SSRF via the Items/RemoteSearch/Image ImageURL parameter. CVSS 3.1CRITICAL 9.8
  • TI-2025-39760 Emby Server is Vulnerable to Remote Code Execution Through XSS in Admin Dashboard CVSS 4.0HIGH 8.4
  • TI-2022-16600 In Emby Server 4.6.7.0, the playlist name field is vulnerable to XSS stored where it is… CVSS 3.1MEDIUM 6.1
  • TI-2025-39564 Emby Server allows attackers to gain administrative server access without preconditions CVSS 4.0CRITICAL 9.3
  • TI-2021-07881 Emby Server versions < 4.6.0.50 is vulnerable to Cross Site Scripting (XSS) vulnerability… CVSS 3.1MEDIUM 6.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences