CVE-2026-32303Network attack vector

Hub impersonation via unverified vault endpoints

Published Mar 20, 2026 · Updated Mar 20, 2026

Origin validation failure in Cryptomator before 1.19.1 allows remote authenticated users to steal Hub session tokens via a tampered vault. The Hub key-loading workflow accepts authentication and API endpoints from vault.cryptomator without verifying host authenticity, allowing a legitimate authentication endpoint to be paired with an attacker-controlled API endpoint. Exploitation requires write access to encrypted cloud data and a user unlocking a Hub-backed vault; stolen tokens permit Hub impersonation and access to unencrypted metadata, not vault contents.

CVSS severity7.6
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Origin validation failure in Cryptomator before 1.19.1 allows remote authenticated users to steal Hub session tokens via a tampered vault. The Hub key-loading workflow accepts authentication and API endpoints from vault.cryptomator without verifying host authenticity, allowing a legitimate authentication endpoint to be paired with an attacker-controlled API endpoint. Exploitation requires write access to encrypted cloud data and a user unlocking a Hub-backed vault; stolen tokens permit Hub impersonation and access to unencrypted metadata, not vault contents.

The record

CVE
CVE-2026-32303
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Cryptomator
Product
Cryptomator
Classifications
CWE-451, CWE-923, CWE-346, CWE-354, T1528
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.19.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cryptomator · Cryptomatorversion=< 1.19.1

Published CVSS scores

5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
7.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-451User Interface (UI) Misrepresentation of Critical Information
CWE-923Improper Restriction of Communication Channel to Intended Endpoints
CWE-346Origin Validation Error
CWE-354Improper Validation of Integrity Check Value
T1528Steal Application Access Token

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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