Vulnerability in Cryptomator
CVE-2026-32303
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (5.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
- Cryptomator — versions < 1.19.1
Weakness classification (CWE)
References
- github.com/cryptomator/cryptomator/security/advisories/GHSA-34rf-rwr3-7g43 (Vendor Advisory)
- github.com/cryptomator/cryptomator/pull/4179 (Issue Tracking)
- github.com/cryptomator/cryptomator/commit/6b82abcd80449a30b561d823193f9ecea542a… (Patch)
- github.com/cryptomator/cryptomator/releases/tag/1.19.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-32303?
- CVE-2026-32303 is a high-severity vulnerability in Cryptomator, classified under Origin Validation Error. CVSS score: 7.6/10. Published 2026-03-20.
- How severe is CVE-2026-32303?
- High severity. CVSS v3 base score is 7.6 out of 10.