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CVE-2026-55414— NL Portal Backend Libraries: Unauthenticated form resolver forwards the privileged Objecten-API token to a caller-supplied URL (SSRF)

Quick assessment

Affected
nl-portal nl-portal-backend-libraries
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NL Portal 后端库为荷兰政府门户网站提供后端组件，这些组件用于与居民、客户、供应商和合作伙伴组织进行交互。在版本 1.1.0 至 3.0.4 以及版本 3.1.0 中，公开可用的 和已弃用的 GraphQL 解析器无需通过 CommonGround 身份认证即可访问，并将由调用方控制的 URL 通过 转发至 ，后者会附带特权 Objecten-API 令牌。主机相等性检查虽将请求限制在配置的 Objecten-API 主机上，但并未对协议方案（scheme）、端口或路径进行约束，从而导致未经身份认证的调用方

CVSS 5.3 · Medium EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
nl-portal nl-portal-backend-libraries >= 1.1.0, < 3.0.4 affected
= 3.1.0 affected
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I. Basic Information for CVE-2026-55414

Vulnerability Information
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Vulnerability Title
NL Portal Backend Libraries: Unauthenticated form resolver forwards the privileged Objecten-API token to a caller-supplied URL (SSRF)
Source: CVE Program / CVE List V5
Vulnerability Description
NL Portal Backend Libraries provide backend components for Dutch government portals that interact with residents, customers, suppliers, and partner organizations. From 1.1.0 until 3.0.4, and in 3.1.0, the public getFormDefinitionByObjectenApiUrl and deprecated getFormDefinitionById GraphQL resolvers are reachable without CommonGroundAuthentication and forward a caller-influenced URL through ObjectenApiService.getObjectByUrl to ObjectsApiClient.getObjectByUrl, which attaches the privileged Objecten-API token. The host-equality check restricts requests to the configured Objecten-API host but does not constrain the scheme, port, or path, allowing an unauthenticated caller to induce a token-bearing request to a chosen endpoint on that host. Standard deployments are not exposed to cross-host SSRF, token capture requires attacker-controlled routing on the configured host, and typed deserialization limits returned data to objects shaped like form definitions. The 3.0 release line is fixed in version 3.0.4. The advisory does not identify a fixed 3.1 release.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
nl-portal nl-portal-backend-libraries >= 1.1.0, < 3.0.4 -

II. Public POCs for CVE-2026-55414

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III. Intelligence Information for CVE-2026-55414

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Vendor Advisories for CVE-2026-55414 (1)

Vendor Pages for CVE-2026-55414 (1)

IV. Related Vulnerabilities

Same product: nl-portal-backend-libraries
Same vendor: nl-portal
Same weakness: CWE-862

V. Comments for CVE-2026-55414

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