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

Quick assessment

Affected
cryptomator cryptomator
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cryptomator是Cryptomator社区的一个简单的数字自卫工具。用于保护数据。 Cryptomator 1.19.1之前版本存在安全漏洞，该漏洞源于完整性检查漏洞，可能导致中间人攻击和令牌泄露。

CVSS 7.6 · High EPSS 0.16% · P4
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I. Basic Information for CVE-2026-32303

Vulnerability Information
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Vulnerability Title
Cryptomator: Tampered vault configuration allows MITM attack on Hub API
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Cryptomator 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cryptomator是Cryptomator社区的一个简单的数字自卫工具。用于保护数据。 Cryptomator 1.19.1之前版本存在安全漏洞，该漏洞源于完整性检查漏洞，可能导致中间人攻击和令牌泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
cryptomator cryptomator < 1.19.1 -

II. Public POCs for CVE-2026-32303

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III. Intelligence Information for CVE-2026-32303

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Patches & Fixes for CVE-2026-32303 (2)

Vendor Advisories for CVE-2026-32303 (1)

Vendor Pages for CVE-2026-32303 (1)

Same Patch Batch · cryptomator · 2026-03-20 · 5 CVEs total

CVE-2026-32318 7.6 HIGH Cryptomator for IOS: Tampered vault configuration allows MITM attack on Hub API
CVE-2026-32317 7.6 HIGH Cryptomator for Android: Tampered vault configuration allows MITM attack on Hub API
CVE-2026-32310 4.1 MEDIUM Cryptomator: Unverified masterkeyfile key IDs can access arbitrary local or UNC paths
CVE-2026-32309 Cryptomator: Hub unlocking accepts plaintext HTTP and unvalidated endpoint schemes

IV. Related Vulnerabilities

Same product: cryptomator
Same vendor: cryptomator
Same weakness: CWE-346

V. Comments for CVE-2026-32303

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