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TI-2021-16569 Aliases CVE-2021-39183GHSA-2hfj-cxw7-g45p

Unsafe inline XSS Owncast

Priority LOW 37CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

Owncast is an open source, self-hosted live video streaming and chat server. In affected versions inline scripts are executed when Javascript is parsed via a paste action. This issue is patched in 0.0.9 by blocking unsafe-inline Content Security Policy and specifying the script-src. The worker-src is required to be set to blob for the video player.

Why it matters now

EPSS 0.00772 55th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed owncast (owncast): 0.0.9github.com/owncast/owncast (Go): 0.0.9

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
owncastowncastbefore 0.0.90.0.9Patch availableCNA
—github.com/owncast/owncast (Go)before 0.0.90.0.9Patch availableGHSA-2hfj-cxw7-g45p
  • owncast Vendorowncast Affected before 0.0.9 Fixed in 0.0.9 Patch available CNA
  • github.com/owncast/owncast (Go) Vendor— Affected before 0.0.9 Fixed in 0.0.9 Patch available GHSA-2hfj-cxw7-g45p

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:owncast_project:owncast:*:*:*:*:*:*:*:*before 0.0.9Vulnerableowncast
  • cpe:2.3:a:owncast_project:owncast:*:*:*:*:*:*:*:* Versions before 0.0.9 Vulnerable ·owncast

Remediation

  • Fix · CNA owncast (owncast) Fixed in 0.0.9
  • Fix · GHSA-2hfj-cxw7-g45p github.com/owncast/owncast (Go) Fixed in 0.0.9 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-39183
  2. 2026-10-03 Alias added: GHSA-2hfj-cxw7-g45p

References

Exploit 1

Advisory 1

Other 1

  • TI-2023-25026 An issue in OwnCast v.0.1.1 allows a remote attacker to execute arbitrary code and obtain… CVSS 3.1CRITICAL 9.8
  • TI-2022-03445 SQL Injection in owncast/owncast CVSS 3.1CRITICAL 9.8
  • TI-2023-02986 Server-Side Request Forgery (SSRF) in owncast/owncast CVSS 3.1MEDIUM 6.5
  • TI-2024-20814 Owncast vulnerable to arbitrary file deletion in emoji.go (GHSL-2023-277) CVSS 3.1MEDIUM 6.5
  • TI-2024-19208 Owncast cross origin request CVSS 3.1CRITICAL 9.1

Sources

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