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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55414
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-15 18:17:27 UTC
Updated2026-10-16 20:04:29 UTC
DescriptionNL 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.004370000 probability, percentile 0.365110000 (date 2026-10-16)

Problem Types: CWE-862 | CWE-918 | CWE-862 CWE-862: Missing Authorization | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nl-portal Nl-portal-backend-libraries affected >= 1.1.0, < 3.0.4 Not specified
CNA Nl-portal Nl-portal-backend-libraries affected = 3.1.0 Not specified

References

ReferenceSourceLinkTags
github.com/nl-portal/nl-portal-backend-libraries/security/advisories/GHS... 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/nl-portal/nl-portal-backend-libraries/releases/tag/3.0.4.RELEASE [email protected] github.com
github.com/nl-portal/nl-portal-backend-libraries/pull/700 [email protected] github.com
github.com/nl-portal/nl-portal-backend-libraries/commit/5ea04ef6445443e2... [email protected] github.com
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