CVE-2026-59788 Stored XSS vulnerability in OAuth configuration form
Attackers can execute arbitrary JavaScript in the Super Admin's browser via a crafted OAuth configuration import, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-59788?
CVE-2026-59788 is a medium-severity cross-site scripting vulnerability in Zabbix, published on 5 Oct 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-59788?
How do I fix CVE-2026-59788?
No fix has been published for CVE-2026-59788 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-59788 being exploited?
There is no known exploitation of CVE-2026-59788 in the wild and no public exploit code.
Sources
Also known as GHSA-q964-q8gh-7pcw, UBUNTU-CVE-2026-59788.