What’s Vulnerable › Vulnerabilities

CVE-2026-32303: Cryptomator: Tampered vault configuration allows MITM attack on Hub API

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-20 · updated 2026-06-17
• Weakness: CWE-346

Description

Cryptomator encrypts data being stored on cloud infrastructure. Prior to version 1.19.1, an integrity check vulnerability allows an attacker to tamper with the vault configuration file leading to a man-in-the-middle vulnerability in Hub key loading mechanism. Before this fix, the client trusted endpoints from the vault config without host authenticity checks, which could allow token exfiltration by mixing a legitimate auth endpoint with a malicious API endpoint. Impacted are users unlocking Hub-backed vaults with affected client versions in environments where an attacker can alter the vault.cryptomator file. This issue has been patched in version 1.19.1.

Affected products

• cryptomator: before 1.19.1 — fixed in 1.19.1

How to fix

Upgrade to a fixed version: cryptomator 1.19.1. Check the vendor advisory for mitigations.

References

• https://github.com/cryptomator/cryptomator/commit/6b82abcd80449a30b561d823193f9ecea542a625
• https://github.com/cryptomator/cryptomator/pull/4179
• https://github.com/cryptomator/cryptomator/releases/tag/1.19.1
• https://github.com/cryptomator/cryptomator/security/advisories/GHSA-34rf-rwr3-7g43

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