Cryptomator: Tampered vault configuration allows MITM attack on Hub API

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-32303",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-03-20T17:57:31.884Z",
    "dateReserved": "2026-03-11T21:16:21.659Z",
    "datePublished": "2026-03-20T17:57:31.884Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M",
        "dateUpdated": "2026-03-20T17:57:31.884Z"
      },
      "title": "Cryptomator: Tampered vault configuration allows MITM attack on Hub API",
      "descriptions": [
        {
          "lang": "en",
          "value": "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": [
        {
          "vendor": "cryptomator",
          "product": "cryptomator",
          "versions": [
            {
              "version": "< 1.19.1",
              "status": "affected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-346: Origin Validation Error",
              "cweId": "CWE-346",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-354: Improper Validation of Integrity Check Value",
              "cweId": "CWE-354",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-451: User Interface (UI) Misrepresentation of Critical Information",
              "cweId": "CWE-451",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-923: Improper Restriction of Communication Channel to Intended Endpoints",
              "cweId": "CWE-923",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/cryptomator/cryptomator/security/advisories/GHSA-34rf-rwr3-7g43",
          "name": "https://github.com/cryptomator/cryptomator/security/advisories/GHSA-34rf-rwr3-7g43",
          "tags": [
            "x_refsource_CONFIRM"
          ]
        },
        {
          "url": "https://github.com/cryptomator/cryptomator/pull/4179",
          "name": "https://github.com/cryptomator/cryptomator/pull/4179",
          "tags": [
            "x_refsource_MISC"
          ]
        },
        {
          "url": "https://github.com/cryptomator/cryptomator/commit/6b82abcd80449a30b561d823193f9ecea542a625",
          "name": "https://github.com/cryptomator/cryptomator/commit/6b82abcd80449a30b561d823193f9ecea542a625",
          "tags": [
            "x_refsource_MISC"
          ]
        },
        {
          "url": "https://github.com/cryptomator/cryptomator/releases/tag/1.19.1",
          "name": "https://github.com/cryptomator/cryptomator/releases/tag/1.19.1",
          "tags": [
            "x_refsource_MISC"
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N",
            "attackVector": "NETWORK",
            "attackComplexity": "LOW",
            "privilegesRequired": "LOW",
            "userInteraction": "REQUIRED",
            "scope": "CHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "availabilityImpact": "NONE",
            "baseScore": 7.6,
            "baseSeverity": "HIGH"
          }
        }
      ]
    }
  }
}