---
id: CVE-2026-59788
title: >-
  The email media type OAuth form passes the Authorization endpoint value to
  window.open() without validating the URL scheme, so a javascript: URL is
  executed in the browser
summary: >-
  The email media type OAuth form passes the Authorization endpoint value to
  window.open() without validating the URL scheme, so a javascript: URL is
  executed in the browser. This means a crafted media type configuration,
  deliverable as an…
severity: medium
cvss: 5.6
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-79
vendor: Zabbix
product: Zabbix
affected:
  - Zabbix >= 7.4.0 <= 7.4.11
published: '2026-10-05'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T15:27:05.657'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59788'
references:
  - url: 'https://support.zabbix.com/browse/ZBX-28198'
    label: security@zabbix.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59788.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-59788'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-59788'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59788'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-05T11:22:54.202007Z'
cvssSource: cna
scores:
  cna: 5.6
  vendor: 4.8
ingestedAt: '2026-10-05T11:18:17.204Z'
epss: 0.00251
epssPercentile: 0.1657
---

## Overview

The email media type OAuth form passes the Authorization endpoint value to window.open() without validating the URL scheme, so a javascript: URL is executed in the browser. This means a crafted media type configuration, deliverable as an import file, runs arbitrary JavaScript as the Super Admin who grants consent.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59788.json)