CVE-2026-33628: Invoiceninja/invoiceninja Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-98wm-cxpw-847p
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CVSS 5.4
CWE-116 CWE-79 CWE-184
Published
Advisory Summary

CVE-2026-33628 is a MODERATE (CVSS 5.4) cross-site scripting vulnerability (CWE-116: Improper Encoding or Escaping of Output) affecting Invoiceninja/invoiceninja libraries in the Packagist ecosystem. The issue involves invoice ninja denylist bypass may lead to stored xss via invoice line items. Remediation is available by upgrading affected packages to version 5.13.4.

CVE-2026-33628 at a Glance

CVE Identifier CVE-2026-33628
GHSA Identifier GHSA-98wm-cxpw-847p
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-116: Improper Encoding or Escaping of Output
Affected Product Invoiceninja/invoiceninja
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-33628

To remediate this vulnerability, upgrade all affected Invoiceninja/invoiceninja dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

invoiceninja/invoiceninja fixed: 5.13.4 
Upgrade invoiceninja/invoiceninja to 5.13.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for invoiceninja/invoiceninja

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-33628, inspect your project dependencies for Invoiceninja/invoiceninja:

inspect dependencies for invoiceninja/invoiceninja

Analyze the terminal output to locate any version of Invoiceninja/invoiceninja in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.13.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-116: Improper Encoding or Escaping of Output, where the product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. as a result, the intended structure of the message is not preserved. In Invoiceninja/invoiceninja, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## Vulnerability Details Invoice line item descriptions in Invoice Ninja v5.13.0 bypass the XSS denylist filter, allowing stored XSS payloads to execute when invoices are rendered in the PDF preview or client portal. The line item description field was not passed through `purify::clean()` before rendering. ## Steps to Reproduce 1. Login as any authenticated user 2. Create or edit an invoice 3. In a line item description, enter: `<img src=x onerror=alert(document.cookie)>` 4. Save the invoice and preview it 5. The XSS payload executes in the browser ## Impact - **Attacker**: Any authenticated user who can create invoices - **Victim**: Any user viewing the invoice (including clients via the portal) - **Specific damage**: Session hijacking, account takeover, data exfiltration ## Proposed Fix Fixed in v5.13.4 by the vendor by adding `purify::clean()` to sanitize line item descriptions.

CVE-2026-33628 Affected Invoiceninja/invoiceninja Versions

1 component(s)
Fixed Versions:
5.13.4
Product / Package Ecosystem Affected Versions Fixed Version
invoiceninja/invoiceninja
 Packagist
< 5.13.4
5.13.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/invoiceninja/invoiceninja/security/advisories/GHSA-98wm-cxpw-847p
NVD — CVE-2026-33628 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33628
Security Fix Commit FIX COMMIT
https://github.com/invoiceninja/invoiceninja/commit/b81a3fc302573fc4a53d61e8537dd19154ce1091
Invoiceninja/invoiceninja Source Repository REPOSITORY
https://github.com/invoiceninja/invoiceninja
Invoiceninja/invoiceninja Release RELEASE
https://github.com/invoiceninja/invoiceninja/releases/tag/v5.13.4

Frequently Asked Questions

What is CVE-2026-33628?
CVE-2026-33628 is a security vulnerability in Invoiceninja/invoiceninja involving Invoice Ninja Denylist Bypass may Lead to Stored XSS via Invoice Line Items under CWE-116: Improper Encoding or Escaping of Output.
Which Invoiceninja/invoiceninja versions are affected?
Affected versions include releases prior to 5.13.4 across affected packages: invoiceninja/invoiceninja.
What version fixes CVE-2026-33628?
Upgrading to 5.13.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is invoiceninja/invoiceninja affected?
Yes, invoiceninja/invoiceninja is affected in releases prior to 5.13.4. Upgrade your dependency to 5.13.4 or later.
What is the CVSS score of CVE-2026-33628?
CVE-2026-33628 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2026-33628?
CVE-2026-33628 is classified under CWE-116: Improper Encoding or Escaping of Output (The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.).
How can I check Packagist dependencies for CVE-2026-33628?
Run the dependency tree command: 'inspect dependencies for invoiceninja/invoiceninja'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-98wm-cxpw-847p",
  "modified" : "2026-03-27T21:34:58Z",
  "published" : "2026-03-24T20:40:16Z",
  "aliases" : [ "CVE-2026-33628" ],
  "summary" : "Invoice Ninja Denylist Bypass may Lead to Stored XSS via Invoice Line Items",
  "details" : "## Vulnerability Details\n\nInvoice line item descriptions in Invoice Ninja v5.13.0 bypass the XSS denylist filter, allowing stored XSS payloads to execute when invoices are rendered in the PDF preview or client portal.\n\nThe line item description field was not passed through `purify::clean()` before rendering.\n\n## Steps to Reproduce\n\n1. Login as any authenticated user\n2. Create or edit an invoice\n3. In a line item description, enter: `<img src=x onerror=alert(document.cookie)>`\n4. Save the invoice and preview it\n5. The XSS payload executes in the browser\n\n## Impact\n\n- **Attacker**: Any authenticated user who can create invoices\n- **Victim**: Any user viewing the invoice (including clients via the portal)\n- **Specific damage**: Session hijacking, account takeover, data exfiltration\n\n## Proposed Fix\n\nFixed in v5.13.4 by the vendor by adding `purify::clean()` to sanitize line item descriptions.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "invoiceninja/invoiceninja"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.13.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/invoiceninja/invoiceninja/security/advisories/GHSA-98wm-cxpw-847p"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33628"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/invoiceninja/invoiceninja/commit/b81a3fc302573fc4a53d61e8537dd19154ce1091"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/invoiceninja/invoiceninja"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/invoiceninja/invoiceninja/releases/tag/v5.13.4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-116", "CWE-184", "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-24T20:40:16Z",
    "nvd_published_at" : "2026-03-26T21:17:07Z"
  }
}