CVE-2021-39183

Published: Dec 14, 2021Modified: Jun 17, 2026

6.1

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitability: 2.8 / Impact: 2.7

Source: NVD

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 (1)

Products: Owncast Project: Owncast

Owncast Project

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Owncast Project Owncast	Before 0.0.9

Related CWEs

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (2)

https://github.com/owncast/owncast/security/advisories/GHSA-2hfj-cxw7-g45p

Source: security-advisories@github.com

ExploitPatchThird Party Advisory

https://github.com/owncast/owncast/security/advisories/GHSA-2hfj-cxw7-g45p

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitPatchThird Party Advisory

Timeline

No history available yet.