Security readout for executives and security teams
Plain-English summary
Emby Server before 4.6.0.50 has a reported cross-site scripting issue involving crafted GET requests to its /web interface. Business impact depends on whether the Emby web interface is exposed and who can reach it. The source bundle does not provide severity, CVSS, authentication requirements, or confirmed exploitation.
Executive priority
Treat as a targeted hygiene issue unless your Emby web interface is exposed broadly. Prioritize inventory, access restriction, and version remediation, but urgency cannot be rated precisely from the available evidence.
Technical view
CVE-2021-25828 describes XSS in Emby Server versions below 4.6.0.50 via a crafted GET request to /web. The provided record has no CVSS, CWE, or detailed affected CPE data. The title identifies Emby Server and the version boundary, but operational prerequisites and patch details are not fully evidenced.
Likely exposure
Organizations running Emby Server below 4.6.0.50, especially where the /web interface is reachable by users, administrators, or the internet. Exposure cannot be narrowed further from the supplied sources.
Exploitation context
The source bundle does not report active exploitation, and CVE is not marked KEV. It only states that crafted GET requests to /web can trigger XSS. Authentication, user interaction, and exploit maturity are not specified.
Researcher notes
Evidence is sparse. The affected array is not populated, severity is unknown, and the only reference is a GitHub issue. Avoid assuming exploitability details beyond XSS via crafted GET requests to /web in Emby Server below 4.6.0.50.
Mitigation direction
- Inventory Emby Server deployments and record exact versions.
- Prioritize moving any version below 4.6.0.50 to vendor-supported guidance.
- Restrict access to the Emby /web interface where feasible.
- Monitor vendor issue and CVE records for confirmed remediation details.
- Review web access logs for unusual /web request patterns.
Validation and detection
- Confirm whether Emby Server is present in asset inventory.
- Check deployed Emby Server versions against the below-4.6.0.50 boundary.
- Determine whether /web is internet-facing or internally restricted.
- Review authentication and access controls around the web interface.
- Document uncertainty where CVSS, CWE, or fix notes are unavailable.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-25828 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/MediaBrowser/Emby/issues/3785CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.