# CVE-2026-56677: 9Router: Authenticated Server-Side Request Forgery (SSRF) via OIDC Provider Test Endpoint

> Attackers can exploit an SSRF vulnerability in the OIDC test endpoint to scan internal services and access sensitive data when dashboard login is disabled.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Aug 2026
- **Updated:** 18 Aug 2026
- **Also known as:** GHSA-8g4w-4ffg-8vgx

## What is CVE-2026-56677?

CVE-2026-56677 is a high-severity server-side request forgery vulnerability in decolua 9router, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

9Router is an AI router & token saver. In 0.5.4 and earlier, the POST /api/auth/oidc/test endpoint in src/app/api/auth/oidc/test/route.js passes the user-controlled issuerUrl parameter to fetchOidcDiscovery() in src/lib/auth/oidc.js without restricting private or loopback destinations, allowing unauthenticated attackers when dashboard login is disabled to scan internal services and reflect OIDC discovery fields including token_endpoint and jwks_uri.

Weakness: CWE-918 (Server-Side Request Forgery), CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-56677?

2 open source packages ship an affected version, including 9router.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `9router` | npm | All versions to 0.5.4 | None |
| `9router` | npm | All versions to 0.5.4 | None |

## How do I fix CVE-2026-56677?

No fix has been published for CVE-2026-56677 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-56677 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56677 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56677 and fix it if it is affected.

What it is: CVE-2026-56677 is a high-severity server-side request forgery vulnerability in decolua 9router, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56677 exists.

Affected packages and fixed versions:
- 9router (npm): affected all versions up to 0.5.4; no fix listed
- 9router (npm): affected all versions up to 0.5.4; no fix listed

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-2026-56677/ (Markdown: https://insights.sbomify.com/CVE-2026-56677/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56677
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56677
- OSV: https://osv.dev/vulnerability/CVE-2026-56677

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-56677/
Summaries are generated and may contain mistakes; the official description above is the record.