What’s Vulnerable › Vulnerabilities

CVE-2026-56233: Capgo - SSRF and Privilege Escalation via Path Traversal in Builder Upload Proxy

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-30 · updated 2026-07-01
• Weakness: CWE-22

Description

Capgo before 12.128.2 contains a path traversal vulnerability in the builder upload proxy that allows authenticated users with build permissions to bypass upload restrictions. Attackers can append traversal sequences to the upload path, which are normalized by the WHATWG URL parser, enabling access to internal administrative endpoints with the privileged BUILDER_API_KEY header and resulting in server-side privilege escalation.

Affected products

• Capgo: before 12.128.2 — fixed in 12.128.2

How to fix

Upgrade to a fixed version: Capgo 12.128.2. Check the vendor advisory for mitigations.

References

• https://github.com/Cap-go/capgo/security/advisories/GHSA-qprp-873h-mx6f
• https://www.vulncheck.com/advisories/capgo-ssrf-and-privilege-escalation-via-path-traversal-in-builder-upload-proxy
• https://github.com/Cap-go/capgo/security/advisories/GHSA-qprp-873h-mx6f

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