Medium severity · published Oct 5, 2026
CVE-2026-59788
Stored XSS vulnerability in OAuth configuration form
5.7
CVSS
0.3%
EPSS
No
On KEV
Description
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZA
Zabbix · Zabbix
7.4.0 through 7.4.11 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59788
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59788
support.zabbix.com
https://support.zabbix.com/browse/ZBX-28198
More from Zabbix
9.8
CVE-2022-23131
Unsafe client-side session storage leading to authentication bypass/instance takeover via Zabbix Frontend with configured SAML
5.3
CVE-2022-23134
Possible view of the setup pages by unauthenticated users if config file already exists
9.9
CVE-2024-42327
A non-admin user account on the Zabbix frontend with the default User role, or with any other role that gives API access can exploit this vulnerability
9.8
CVE-2022-43516
A Firewall Rule which allows all incoming TCP connections to all programs from any source and to all ports is created in Windows Firewall after Zabbix agent installation (MSI)
9.8
CVE-2020-11800
Zabbix Server 2.2.x and 3.0.x before 3.0.31, and 3.2 allows remote attackers to execute arbitrary code