Path Traversal in Capgo
CVE-2026-56233
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.
EPSS exploit prediction
EPSS: 0.006 (48.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Capgo — versions 0, 12.128.2
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-qprp-873h-mx6f (vendor-advisory)
- www.vulncheck.com/advisories/capgo-ssrf-and-privilege-escalation-via-path-trave… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56233?
- CVE-2026-56233 is a high-severity vulnerability in Capgo, classified under Path Traversal. CVSS score: 8.3/10. Published 2026-06-30.
- How severe is CVE-2026-56233?
- High severity. CVSS v3 base score is 8.3 out of 10.