# CVE-2026-82029: Invoice Ninja < 5.13.28 Broken Access Control via Vendor Portal

Status: published. Published: 2026-11-04. Updated: 2026-11-08.

Invoice Ninja before 5.13.28 contains a broken access control vulnerability that allows authenticated vendor-portal contacts to access documents belonging to other vendors and clients by exploiting authorization checks that validate only company_id scope instead of vendor ownership. Attackers can request GET /vendor/documents/{hashid}/download or POST /vendor/documents/download_multiple, enumerating predictable sequential Hashids document identifiers due to a default empty HASH_SALT, to read any invoice PDFs, contracts, payment receipts, and expense attachments within the company.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/invoiceninja/invoiceninja/commit/4895dce820e37b849b34af46548afd8520bb81d1

## Affected products and versions

- invoiceninja / invoiceninja (invoiceninja/invoiceninja): ≥ 0; < 5.13.28 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.1 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N; source: CNA: VulnCheck

- CVSS 4.0: 7.1 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.24% as of 2026-11-08; percentile 14.59%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-639, CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/invoiceninja/invoiceninja/releases/tag/v5.13.28 (CNA: VulnCheck; release-notes)

- https://github.com/invoiceninja/invoiceninja/commit/4895dce820e37b849b34af46548afd8520bb81d1 (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/invoice-ninja-broken-access-control-via-vendor-portal (CNA: VulnCheck; third-party-advisory)

- https://github.com/invoiceninja/invoiceninja/commit/4895dce820e37b849b34af46548afd8520bb81d1 (disclosure@vulncheck.com)

- https://github.com/invoiceninja/invoiceninja/releases/tag/v5.13.28 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/invoice-ninja-broken-access-control-via-vendor-portal (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-82029; retrieved 2026-11-08; source updated 2026-11-08

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-82029; retrieved 2026-11-06; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-82029; retrieved 2026-11-08; source updated Not reported

Revision: 2584a96218a982f16952f244bafdcbecac9c76f84864adaac80ee55dcb112712

Canonical: https://y2.dev/cve/CVE-2026-82029

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- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

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