CVE-2026-56309

Description

Capgo before 12.128.2 fails to enforce plan/quota restrictions on the /files/upload/attachments endpoint, allowing plan-blocked apps to create publicly readable R2 objects. Attackers can upload arbitrary attachments using upload-scoped API keys that bypass plan checks, persist outside normal bundle metadata, and survive app deletion, enabling storage and bandwidth abuse.

CVSS Vector

References

• https://github.com/Cap-go/capgo/security/advisories/GHSA-q52j-ggvx-cr4v
• https://www.vulncheck.com/advisories/capgo-plan-bypass-via-unrestricted-attachment-upload-endpoint
• https://github.com/Cap-go/capgo/security/advisories/GHSA-q52j-ggvx-cr4v