Vulnerability · Published Jun 22, 2026 · Assigned by VulnCheck

CVE-2026-56255Capgo - Denial of Service via Unlimited Demo App Creation

Medium 4.3

In plain English

A medium-severity resource allocation without limits in Capgo from Capgo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.4%top 68.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Capgo before 12.128.2 contains a denial of service vulnerability in the POST /app/demo endpoint that allows authenticated users with org write permissions to create unlimited demo applications without rate limiting or quota enforcement. Attackers can repeatedly invoke this endpoint to generate approximately 138 database write operations per request, causing degraded performance, increased costs, and potential service instability.

Affected products (as reported)

Vendor	Product	Versions
Capgo	Capgo	0 – before 12.128.2

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

References

GitHub Security Advisory (GHSA-q2xx-6h9x-43fw) vendor-advisory
VulnCheck Advisory: Capgo - Denial of Service via Unlimited Demo App Creation third-party-advisory