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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.

PUBLISHED Reserved 2026-06-20 | Published 2026-07-10 | Updated 2026-07-10 | Assigner VulnCheck




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

Problem types

Allocation of Resources Without Limits or Throttling

Product status

Default status
unaffected

Any version before 12.128.2
affected

12.128.2 (semver)
unaffected

Credits

Judel777 reporter

References

github.com/.../capgo/security/advisories/GHSA-q52j-ggvx-cr4v exploit

github.com/.../capgo/security/advisories/GHSA-q52j-ggvx-cr4v (GitHub Security Advisory (GHSA-q52j-ggvx-cr4v)) vendor-advisory

www.vulncheck.com/...unrestricted-attachment-upload-endpoint (VulnCheck Advisory: Capgo - Plan Bypass via Unrestricted Attachment Upload Endpoint) third-party-advisory

cve.org (CVE-2026-56309)

nvd.nist.gov (CVE-2026-56309)

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