CVE-2026-56299

Medium

Description

Capgo before 12.128.2 contains an authentication bypass vulnerability in the /build/upload/:jobId/* endpoint that allows unauthenticated attackers to trigger consistent 500 errors. Remote attackers can send OPTIONS requests to bypass authentication middleware and invoke tusProxy logic with invalid credentials, enabling trivial request flooding and denial of service.

SeverityMedium

CVSS5.3

Exploit probability—

ProductCapgo

PublishedJun 21, 2026

First seenJun 21, 2026

Weakness typeCWE-306Missing authentication for critical function

How to fix

Update

Capgo Capgo12.128.2 or later

Vendor advisories

github.com/Cap-go/capgo/security/advisories/GHSA-6c7m-4223-446j

Affected products

Product	Affected versions	Fixed in
Capgo Capgo	v < 12.128.2	12.128.2

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