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Vulnerability record · CVE-2026-56237 · published 24 June 2026

CVE-2026-56237: Improper authentication vulnerability

Capgo before 12.128.2 contains a broken authentication vulnerability in its API key generation mechanism. API keys are exposed in frontend requests, and the backend fails to validate that keys are securely generated and bound to the authenticated user. An attacker can tamper with the API key parameter in the generation request and supply arbitrary values, generating custom API keys without proper authorization, which can lead to unauthorized access to protected endpoints.

9.3 CVSS 4.0 Critical EPSS 0.52% · top 58.3% CWE-287 · Improper authentication Deferred
9.3CVSS 4.0 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
25 Jun 2026Last modified by NVD

Description

Capgo before 12.128.2 contains a broken authentication vulnerability in its API key generation mechanism. API keys are exposed in frontend requests, and the backend fails to validate that keys are securely generated and bound to the authenticated user. An attacker can tamper with the API key parameter in the generation request and supply arbitrary values, generating custom API keys without proper authorization, which can lead to unauthorized access to protected endpoints.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/Cap-go/capgo/security/advisories/GHSA-22w2-mx2h-4fr7
https://www.vulncheck.com/advisories/capgo-unauthenticated-api-key-generation-via-client-side-parameter-manipulation
https://github.com/Cap-go/capgo/security/advisories/GHSA-22w2-mx2h-4fr7

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Source: NIST National Vulnerability Database (record CVE-2026-56237), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.