Cryptomator up to 1.19.1 Hub API CheckHostTrustController.getAuthority authentication bypass

Summaryinfo

A vulnerability, which was classified as problematic, was found in Cryptomator up to 1.19.1. This impacts the function CheckHostTrustController.getAuthority of the component Hub API. Executing a manipulation can lead to authentication bypass. This vulnerability is tracked as CVE-2026-33472. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Cryptomator up to 1.19.1. It has been declared as problematic. This vulnerability affects the function CheckHostTrustController.getAuthority of the component Hub API. The manipulation with an unknown input leads to a authentication bypass vulnerability. The CWE definition for the vulnerability is CWE-305. The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error. As an impact it is known to affect confidentiality. CVE summarizes:

Cryptomator is an open-source client-side encryption application for cloud storage. Version 1.19.1 contains a logic flaw in CheckHostTrustController.getAuthority() that allows an attacker to bypass the security fix for CVE-2026-32303. The method hardcodes the URI scheme based on port number, causing HTTPS URLs with port 80 to produce the same authority string as HTTP URLs, which defeats both the consistency check and the HTTP block validation. An attacker with write access to a cloud-synced vault.cryptomator file can craft a Hub configuration where apiBaseUrl and authEndpoint use HTTPS with port 80 to pass auto-trust validation, while tokenEndpoint uses plaintext HTTP. The vault is auto-trusted without user prompt, and a network-positioned attacker can intercept the OAuth token exchange to access the Cryptomator Hub API as the victim. This issue has been fixed in version 1.19.2.

The advisory is available at github.com. This vulnerability was named CVE-2026-33472 since 03/20/2026. The exploitation appears to be difficult. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 1.19.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• Cryptomator

Version

• 1.19.0
• 1.19.1

Website

• Product: https://github.com/cryptomator/cryptomator/

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