CVE-2026-56299
Capgo - Denial of Service via Unauthenticated OPTIONS Request to /build/upload Endpoint
- State
- Published
- Severity
- 6.9 Medium
- Published
- Jun 21, 2026
- Updated
- Jun 23, 2026
- Reserved
- Jun 20, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
CapgoCapgo |
|
References
- GHSA Advisory GHSA-6c7m-4223-446jvendor-advisory
- VulnCheck Advisory: Capgo - Denial of Service via Unauthenticated OPTIONS Request to /build/upload Endpointthird-party-advisory
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