CVE-2026-33472 Cryptomator Hub OAuth token exchange HTTP downgrade via getAuthority() scheme confusion (CVE-2026-32303 bypass)
Attackers can bypass HTTPS enforcement in Cryptomator Hub OAuth flows, allowing interception of tokens and unauthorized API access via network position.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-33472?
CVE-2026-33472 is a medium-severity vulnerability in cryptomator, published on 16 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-33472?
It affects 1 product.
Products include Cryptomator Cryptomator.
How do I fix CVE-2026-33472?
No fix has been published for CVE-2026-33472 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-33472 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33472 exists.
Other vulnerabilities in cryptomator
- CVE-2026-32309 Cryptomator: Hub unlocking accepts plaintext HTTP and unvalidated endpoint schemes
- CVE-2022-25366 Code injection in n/a
- CVE-2026-32303 Cryptomator: Tampered vault configuration allows MITM attack on Hub API
- CVE-2026-32317 Cryptomator for Android: Tampered vault configuration allows MITM attack on Hub API
- CVE-2026-32318 Cryptomator for IOS: Tampered vault configuration allows MITM attack on Hub API
Sources
Also known as GHSA-9q8x-whrw-x44p.