CVE-2026-100849 AzuraCast before 0.23.8 SSRF Filter Bypass via Hostname and Private IPs
Low-privileged users can bypass SSRF filters to force the server to send requests to internal or private network targets, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100849?
CVE-2026-100849 is a high-severity server-side request forgery vulnerability in AzuraCast, published on 27 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
AzuraCast is a self-hosted web radio management suite. In AzuraCast before 0.23.8, the station webhook URL validation in AbstractConnector::getValidUrl() (backend/src/Webhook/Connector/AbstractConnector.php), used by the Generic and Discord webhook connectors, rejects only URLs whose host is a literal link-local IP address (169.254.0.0/16 or fe80::/10). Loopback addresses and RFC1918 private ranges are not rejected, and any non-literal-IP hostname causes the IP parsing call to throw, which skips the check entirely. A user holding only the station-scoped WebHooks permission can therefore configure a webhook pointing at an internal, loopback, or private-network target and cause the server to issue an outbound HTTP POST containing the station's Now Playing data, resulting in server-side request forgery. The PUT /station/{id}/webhook/{id}/test endpoint allows the same low-privileged user to trigger the request on demand. At the time of the advisory no patched version was available.
Weakness: CWE-918
Which versions are affected by CVE-2026-100849?
How do I fix CVE-2026-100849?
No fix has been published for CVE-2026-100849 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-100849 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100849 exists.
Sources
Also known as GHSA-3jp3-3wqw-jvw4, GHSA-c94r-cgjw-f264.