CVE-2026-40302: medium-severity vulnerability in openziti zrok
zrok has reflected XSS in GitHub OAuth callback via unsanitized refreshInterval error rendering
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.1epss 0.2%
zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the proxyUi template engine uses Go's text/template (which performs no HTML escaping) instead of html/template. The GitHub OAuth callback handlers in both publicProxy and dynamicProxy embed the attacker-controlled refreshInterval query parameter verbatim into an error message when time.ParseDuration fails, and render that error unescaped into HTML. An attacker can deliver a crafted login URL to a victim; after the victim completes the GitHub OAuth flow, the callback page executes arbitrary JavaScript in the OAuth server's origin. Version 2.0.1 patches the issue.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
openziti · zrokRelated CVEs — openziti zrok
In the same product, most dangerous first.
CVE-2026-45568CRITICALzrok Python ProxyShare can be used as an SSRF proxy through absolute URL pathsEPSS 0.5%CVE-2026-45576HIGHzrok copy writes attacker-controlled WebDAV paths outside the destination rootEPSS 0.5%CVE-2026-40303HIGHzrok allows unauthenticated DoS via unbounded memory allocation in striped session cookie parsingEPSS 0.5%CVE-2026-42275HIGHzrok: WebDAV drive backend follows symlinks outside DriveRoot, enabling host filesystem read/writeEPSS 0.3%CVE-2026-40304MEDIUMzrok's broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend recordsEPSS 0.3%