CVE-2021-25828: Emby Server versions < 4.6.0.50 is vulnerable to Cross Site Scripting (XSS) vulnerability via a crafted GET re

Q: How do I fix CVE-2021-25828?

emby: upgrade to 4.6.0.50. Exact commands for each OS are on this page.

Q: Is CVE-2021-25828 being exploited?

CVE-2021-25828 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-25828 affect?

CVE-2021-25828 affects emby. Severity is medium (CVSS 6.1). Emby Server versions < 4.6.0.50 is vulnerable to Cross Site Scripting (XSS) vulnerability via a crafted GET request to /web.

Q: How urgent is CVE-2021-25828?

Priority 37/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2021-25828 is a medium-severity flaw (CVSS 6.1) affecting emby. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Emby Server versions < 4.6.0.50 is vulnerable to Cross Site Scripting (XSS) vulnerability via a crafted GET request to /web.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-06-28
Last modified	2026-10-24

Publisher (CNA): MITRE · Vendor: emby

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-06-28 20:15 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

emby emby UPGRADE

Affected: < 4.6.0.50

Fixed in: 4.6.0.50

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy emby || rpm -q emby || emby --version

2. UPGRADE to 4.6.0.50 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade emby

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade emby

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source

sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source

sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-25828?

emby: upgrade to 4.6.0.50. Exact commands for each OS are on this page.

Is CVE-2021-25828 being exploited?

CVE-2021-25828 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-25828 affect?

CVE-2021-25828 affects emby. Severity is medium (CVSS 6.1). Emby Server versions < 4.6.0.50 is vulnerable to Cross Site Scripting (XSS) vulnerability via a crafted GET request to /web.

How urgent is CVE-2021-25828?

Priority 37/100. Public exploit reference

Related CVEs

CVE-2021-25827 CRITICAL 9.8 UPGRADE Emby Server < 4.7.12.0 is vulnerable to a login bypass attack by setting the X-Forwarded-For header to a local

References

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