# 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.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** GHSA-3jp3-3wqw-jvw4, GHSA-c94r-cgjw-f264

## 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 (Server-Side Request Forgery)

## 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.

## Is CVE-2026-100849 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100849 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-100849 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100849 exists.

Affected product: AzuraCast. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-100849/ (Markdown: https://insights.sbomify.com/CVE-2026-100849/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100849
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100849
- OSV: https://osv.dev/vulnerability/CVE-2026-100849

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-100849/
Summaries are generated and may contain mistakes; the official description above is the record.