# NL Portal Backend Libraries: Unauthenticated form resolver forwards the privileged Objecten-API token to a caller-supplied URL (SSRF)

Advisory record · `GHSA-xm3x-9cfw-jhx4`

- **Identifiers:** `GHSA-xm3x-9cfw-jhx4` · `CVE-2026-55414`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-862](https://cwe.mitre.org/data/definitions/862.html) · [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Broken access control](https://agentprime.io/advisories/tag/access-control.md) · [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 19 Jun 2026
- **Updated:** 19 Jun 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 19 Jun 2026, 14:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `nl.nl-portal:form` (Maven): affected `>=1.1.0, <3.0.4`; fixed in `3.0.4`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> GHSA-xm3x-9cfw-jhx4 affects the Maven package nl.nl-portal:form, versions 1.1.0 up to but not including 3.0.4. An unauthenticated caller of a public GraphQL resolver can make the backend send the privileged Objecten-API token to a caller-chosen URL on the configured Objecten-API host, a constrained server-side request forgery. Upgrade to 3.0.4 or later; the fix removes the unauthenticated resolvers, and the frontend libraries must also be upgraded to v3.0.3 or later because of breaking query changes.

Written 3 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0044, the 38th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:20 UTC: First seen by agentprime
- 31 Oct 2026, 14:20 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-xm3x-9cfw-jhx4)

## Sources

- [GitHub Advisory Database: GHSA-xm3x-9cfw-jhx4](https://github.com/advisories/GHSA-xm3x-9cfw-jhx4)
- [OSV: GHSA-xm3x-9cfw-jhx4](https://osv.dev/vulnerability/GHSA-xm3x-9cfw-jhx4)
- <https://github.com/nl-portal/nl-portal-backend-libraries/security/advisories/GHSA-xm3x-9cfw-jhx4>
- <https://github.com/nl-portal/nl-portal-backend-libraries/pull/700>
- <https://github.com/nl-portal/nl-portal-backend-libraries>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-xm3x-9cfw-jhx4>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-xm3x-9cfw-jhx4/>. Everything for agents: <https://agentprime.io/llms.txt>.