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CVE-2026-56237: Capgo Broken Authentication in API Key Generation

CVE-2026-56237 affects Capgo versions before 12.128.2 and involves broken authentication in the API key generation mechanism. The backend does not verify that generated keys are securely created and bound to the authenticated user. VulnCheck reports a critical CVSS 3.1 score of 9.1, and no confirmed exploitation appears in the sources consulted.

Published Oct 13, 2026 · Updated Oct 13, 2026 · Ler em português

Overview

CVE-2026-56237 affects Capgo before 12.128.2 and is described as a broken authentication issue in the API key generation mechanism. According to the record, API keys are exposed in frontend requests and the backend does not verify that generated keys are securely produced and bound to the authenticated user.

Impact

  • The described consequence is unauthorized access to protected endpoints.
  • The weakness is classified as CWE-287, Improper Authentication.
  • VulnCheck scores the issue at CVSS 3.1 9.1 and CVSS 4.0 9.3, both rated critical in the record.

Affected products and versions

  • Product: Capgo, versions before 12.128.2, as stated in the record description.
  • The record contains no structured affected or fixed version list. That 12.128.2 is the first fixed release is an inference from the version boundary and should be confirmed in the GitHub advisory.

Exploitation status

The CISA KEV catalog does not list this CVE according to the record. No confirmed exploitation appears in the sources consulted for this analysis.

Remediation and mitigation

  • Upgrade Capgo to version 12.128.2 or later, after confirming the fix in the vendor advisory.
  • Rotate API keys generated through the affected mechanism, and treat keys issued before the upgrade as potentially untrusted.
  • Review access logs for requests to protected endpoints that used keys not issued through the normal process.
  • Restrict access to the key generation endpoint at the network or gateway layer until the upgrade is applied.

Detection guidance

  • Audit API key creation events for keys with unexpected formats, unusual owners, or creation patterns that do not match normal provisioning.
  • Alert on successful authentication using API keys created outside the expected workflow.
  • Correlate each key creation with the account that requested it to identify keys not bound to their owner.

Limitations of the available information

  • The record provides no structured affected or fixed version data, and EPSS and SSVC values are missing.
  • NVD analysis is marked as deferred in the record, so NVD-based scoring may change.
  • Technical details of the parameter manipulation are intentionally not reproduced.

Frequently asked questions

What is CVE-2026-56237?

It is a broken authentication vulnerability in the API key generation mechanism of Capgo before version 12.128.2, where the backend does not verify that generated keys are securely created and bound to the user.

Is this vulnerability being actively exploited?

The record shows it is not listed in the CISA KEV catalog, and no confirmed exploitation appears in the sources consulted for this analysis.

What should administrators do first?

Confirm the fix in the vendor advisory, upgrade Capgo to 12.128.2 or later, and rotate API keys generated through the affected mechanism.

This analysis was drafted with AI assistance from verified source data and automatically checked against it.