EUVD-2026-13750
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N
Lifecycle Timeline
3Description
Cryptomator encrypts data being stored on cloud infrastructure. From version 1.6.0 to before version 1.19.1, vault configuration is parsed before its integrity is verified, and the masterkeyfile loader uses the unverified keyId as a filesystem path. The loader resolves keyId.getSchemeSpecificPart() directly against the vault path and immediately calls Files.exists(...). This allows a malicious vault config to supply parent-directory escapes, absolute local paths, or UNC paths (e.g., masterkeyfile://attacker/share/masterkey.cryptomator). On Windows, the UNC variant is especially dangerous because Path.resolve("//attacker/share/...") becomes \\attacker\share\..., so the existence check can trigger outbound SMB access before the user even enters a passphrase. This issue has been patched in version 1.19.1.
Analysis
Cryptomator versions 1.6.0 through 1.19.0 contain a path traversal vulnerability in vault configuration parsing where the masterkeyfile loader resolves an unverified keyId parameter as a filesystem path before integrity checks are performed. An attacker with the ability to supply a malicious vault configuration can exploit this to trigger arbitrary file existence checks, including UNC paths on Windows that can initiate outbound SMB connections before the user even enters a passphrase, potentially leading to information disclosure about local file structure and network exposure. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Review file handling controls.
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External POC / Exploit Code
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