How severe is CVE-2021-25828?

CVE-2021-25828 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-25828 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25828?

CVE-2021-25828 affects Emby. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-25828?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-25828 published?

CVE-2021-25828 was published on 2023-06-28 and last updated on 2026-06-17.

CVE-2021-25828

CVE-2021-25828 is a medium-severity vulnerability in Emby with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Emby
Published: 2023-06-28
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-25828?: Emby Server versions < 4.6.0.50 is vulnerable to Cross Site Scripting (XSS) vulnerability via a crafted GET request to /web.
How severe is CVE-2021-25828?: CVE-2021-25828 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-25828 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25828?: CVE-2021-25828 affects Emby. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-25828?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-25828 published?: CVE-2021-25828 was published on 2023-06-28 and last updated on 2026-06-17.

References

https://github.com/MediaBrowser/Emby/issues/3785

Affected products (1)

cpe:2.3:a:emby:emby:*:*:*:*:*:*:*:*

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