What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-22 · updated 2026-06-23
• Weakness: CWE-770

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

• 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-q2xx-6h9x-43fw
• https://www.vulncheck.com/advisories/capgo-denial-of-service-via-unlimited-demo-app-creation
• https://github.com/Cap-go/capgo/security/advisories/GHSA-q2xx-6h9x-43fw

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