CVE-2026-56233 Capgo - SSRF and Privilege Escalation via Path Traversal in Builder Upload Proxy
Authenticated attackers can exploit path traversal in the upload proxy to access internal admin endpoints, leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56233?
CVE-2026-56233 is a high-severity path traversal vulnerability in Capgo, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-56233?
How do I fix CVE-2026-56233?
No fix has been published for CVE-2026-56233 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-56233 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56233 exists.
Sources
Also known as GHSA-qprp-873h-mx6f, GHSA-r799-c3x3-8633.