Bug 2545872 (CVE-2026-59788)

Summary: CVE-2026-59788 zabbix: Zabbix: Arbitrary script execution via unvalidated OAuth authorization endpoint URL
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Zabbix. The application fails to properly validate the URL scheme of the authorization endpoint in the email media type OAuth form. An attacker can provide a specially crafted configuration file containing a malicious script link. When a privileged administrator attempts to grant consent, arbitrary JavaScript executes in their browser, potentially allowing unauthorized actions or disclosure of sensitive administrative information.
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Description OSIDB Bzimport 2026-10-05 10:50:19 UTC 
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.