CVE-2026-95624
Received Received - Intake

Tauri Updater Plugin Downgrade Protection Bypass via XSS

Publication date: 2026-09-22

Last updated on: 2026-09-22

Assigner: JFrog

Description
The Tauri updater plugin's 'check' IPC command accepts an allowDowngrades boolean parameter directly from frontend JavaScript code. When set to true, it replaces the version comparator from "update must be newer" to "update must be different." Because the default permission set grants allow-check to the webview, any XSS in the app frontend can invoke this command and bypass the only anti-rollback protection the updater offers. Combined with another bug, this enables downgrade attacks without even needing to fake a higher version number.

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Meta Information

Published
2026-09-22
Last Modified
2026-09-22
Generated
2026-09-22
AI Q&A
2026-09-22
EPSS Evaluated
N/A
NVD
CVE-2026-95624
EUVD
EUVD-2026-84577

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
tauri updater 2.12.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

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Executive Summary

This vulnerability involves the Tauri updater plugin's 'check' IPC command accepting an allowDowngrades boolean parameter from frontend JavaScript. When set to true, it changes the version comparator from requiring a newer version to just a different version. Since the default permission allows the webview to invoke this command, an XSS attack in the frontend could bypass the updater's anti-rollback protection. This enables downgrade attacks without needing to fake version numbers.

Detection Guidance

Check Tauri updater plugin configuration for allowDowngrades setting in plugins.updater.allowDowngrades. Review frontend JavaScript for IPC calls to the check command with allowDowngrades parameter set to true. Inspect network traffic for unusual version comparison requests.

Impact Analysis

If you use a Tauri application with the updater plugin, an attacker could exploit an XSS vulnerability in the app's frontend to force a downgrade to an older, potentially vulnerable version of the application. This could allow the attacker to reintroduce known security flaws or bypass security controls that were fixed in newer versions.

Mitigation Strategies

Update Tauri updater plugin to v2.12.0 or later. Set plugins.updater.allowDowngrades to false in configuration. Remove any frontend JavaScript code that passes allowDowngrades=true to the check command. Implement strict version comparison logic in your application.

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