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CVE-2021-39183

Unsafe inline XSS Owncast

MEDIUM
6.1
CVSS Score
Published: December 14, 2021 at 08:05 PM UTC
Updated: June 17, 2026 at 04:03 AM UTC
1 product affected across 1 vendorOwncast

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.8%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Owncast· Owncast Project
95%
v < 0.0.9
Affected range stops below 0.0.9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMExploitPatchThird Party Advisory
Source: [email protected]
https://github.com/owncast/owncast/security/advisories/GHSA-2hfj-cxw7-g45p

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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