CVE-2026-33742Public exploitNetwork attack vector

Stored XSS via unsanitized product-note Markdown

Published Mar 26, 2026 · Updated Mar 26, 2026

Stored XSS in Invoice Ninja before 5.13.4 allows remote authenticated users to execute JavaScript via crafted product notes. The invoice template path renders Markdown from a product's notes field as raw HTML without applying purify::clean() to the parser output. Any authenticated user who can create products can plant the payload, but execution requires another user to view an invoice containing that product, enabling session theft or data access in that viewer's context.

CVSS severity5.4
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Invoice Ninja before 5.13.4 allows remote authenticated users to execute JavaScript via crafted product notes. The invoice template path renders Markdown from a product's notes field as raw HTML without applying purify::clean() to the parser output. Any authenticated user who can create products can plant the payload, but execution requires another user to view an invoice containing that product, enabling session theft or data access in that viewer's context.

The record

CVE
CVE-2026-33742
Published
Mar 26, 2026
Updated
Mar 26, 2026
Vendor
Invoice Ninja
Product
Invoice Ninja
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.13.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Invoice Ninja · Invoice Ninjaversion=< 5.13.4

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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