Vulnerability · Published Jun 30, 2026 · Assigned by VulnCheck

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

High 8.3

In plain English

A high-severity path traversal in Capgo from Capgo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).

Severity (CVSS 3.1)8.3High

Exploit odds (30 days)0.6%top 49.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Capgo	Capgo	0 – before 12.128.2

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

References

GitHub Security Advisory (GHSA-qprp-873h-mx6f) vendor-advisory
VulnCheck Advisory: Capgo - SSRF and Privilege Escalation via Path Traversal in Builder Upload Proxy third-party-advisory