CVE-2026-42184: Tauri: Origin Confusion Allows Remote Pages to Invoke Local-Only IPC Commands

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-27 · updated 2026-10-26
Weakness: CWE-918

Description

Tauri is a framework for building binaries for all major desktop platforms. From 2.0 to 2.11.0, a flaw in Tauri's is_local_url() function causes it to incorrectly classify remote URLs as trusted local origins on Windows and Android. On these systems, Tauri maps custom URI scheme protocols to http://<scheme>.localhost/ because those platforms' WebView implementations cannot serve custom URI schemes directly. The issue is that Tauri's check to see if the origin is local, only checks the first subdomain of the URL. An attacker can abuse this by hosting a page on a domain whose subdomain matches the custom scheme of the application. This vulnerability is fixed in 2.10.3.

Affected products

tauri-apps tauri: from 2.0.0 before 2.10.3 — fixed in 2.10.3

How to fix

Upgrade to a fixed version: tauri-apps tauri 2.10.3. Check the vendor advisory for mitigations.

References

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