{"id":"CVE-2026-32303","state":"PUBLISHED","title":"Cryptomator: Tampered vault configuration allows MITM attack on Hub API","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.","publishedAt":"2026-03-20T17:57:31.884Z","updatedAt":"2026-03-23T21:41:57.420Z","severity":{"score":7.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["cryptomator cryptomator"],"affected":[{"vendor":"cryptomator","product":"cryptomator","versions":[{"version":"< 1.19.1","status":"affected"}]}],"references":["https://github.com/cryptomator/cryptomator/security/advisories/GHSA-34rf-rwr3-7g43","https://github.com/cryptomator/cryptomator/pull/4179","https://github.com/cryptomator/cryptomator/commit/6b82abcd80449a30b561d823193f9ecea542a625","https://github.com/cryptomator/cryptomator/releases/tag/1.19.1"],"weaknesses":["CWE-346","CWE-354","CWE-451","CWE-923"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/32xxx/CVE-2026-32303.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-32303","state":"PUBLISHED","datePublished":"2026-03-20T17:57:31.884Z","dateUpdated":"2026-03-23T21:41:57.420Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-11T21:16:21.659Z"},"containers":{"cna":{"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"}]}],"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":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","lang":"en","description":"CWE-346: Origin Validation Error","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-354","lang":"en","description":"CWE-354: Improper Validation of Integrity Check Value","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-451","lang":"en","description":"CWE-451: User Interface (UI) Misrepresentation of Critical Information","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-923","lang":"en","description":"CWE-923: Improper Restriction of Communication Channel to Intended Endpoints","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-20T17:57:31.884Z"},"source":{"advisory":"GHSA-34rf-rwr3-7g43","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-23T20:52:44.437617Z","id":"CVE-2026-32303","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-23T21:41:57.420Z"}}]}}}