Owncast is an open source, self-hosted, decentralized, single user live video streaming and chat server. In versions 0.1.2 and prior, a lenient CORS policy allows attackers to make a cross origin request, reading privileged information. This can be used to leak the admin password. Commit 9215d9ba0f29d62201d3feea9e77dcd274581624 fixes this issue.
https://securitylab.github.com/advisories/GHSL-2023-261_Owncast/
https://github.com/owncast/owncast/commit/9215d9ba0f29d62201d3feea9e77dcd274581624
https://github.com/owncast/owncast/blob/v0.1.2/router/middleware/auth.go#L32
Published: 2024-03-20
Updated: 2025-10-14
Base Score: 9.4
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N
Severity: High
Base Score: 9.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Severity: Critical
Base Score: 8.8
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Severity: High
EPSS: 0.00115