CVE-2026-54683: Access Control Flaw (CVSS 6.5)

Description

NL Portal Backend Libraries provide backend components for Dutch government portals that interact with residents, customers, suppliers, and partner organizations. Prior to 3.0.3, both the getDocumentContent GraphQL query and GET /api/documentapi/{documentapi}/document/{documentId}/content REST route allow any authenticated portal user to retrieve a document without checking ownership of or another authorized relationship to it. A user with a valid login and another person's document identifier can read that document's contents, which may include sensitive personal information. Document identifiers are random and difficult to guess, but they can leak through other channels. This issue is fixed in version 3.0.3.

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CVSS v3.1 Score

6.5

MEDIUM

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

Weakness Type (CWE)

CWE-285 CWE-285

CWE-639 CWE-639

References

Other References

https://github.com/nl-portal/nl-portal-backend-libraries/commit/6e738a876ff9f581991b5b070706100b5516e183 https://github.com/nl-portal/nl-portal-backend-libraries/commit/e326e6db862f71f76dd46d3b17cbb5fa6f2fba02 https://github.com/nl-portal/nl-portal-backend-libraries/pull/684 https://github.com/nl-portal/nl-portal-backend-libraries/pull/690 https://github.com/nl-portal/nl-portal-backend-libraries/releases/tag/3.0.3.RELEASE https://github.com/nl-portal/nl-portal-backend-libraries/security/advisories/GHSA-jr45-52cw-69h5

Frequently Asked Questions

What is CVE-2026-54683? +

NL Portal Backend Libraries provide backend components for Dutch government portals that interact with residents, customers, suppliers, and partner organizations. Prior to 3.0.3, both the getDocumentContent GraphQL query and GET /api/documentapi/{documentapi}/document/{documentId}/content REST route allow any authenticated portal user to retrieve a document without checking ownership of or another authorized relationship to it. A user with a valid login and another person's document identifier can read that document's contents, which may include sensitive personal information. Document identifiers are random and difficult to guess, but they can leak through other channels. This issue is fixed in version 3.0.3. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-54683? +

CVE-2026-54683 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2026-54683? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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