What is CVE-2026-56309?

CVE-2026-56309 is a medium-severity vulnerability in Capgo, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.4/10. Published 2026-07-10.

How severe is CVE-2026-56309?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Resource exhaustion in Capgo

CVE-2026-56309

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…

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.

Affected products

Capgo — versions 0, 12.128.2

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-56309?: CVE-2026-56309 is a medium-severity vulnerability in Capgo, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.4/10. Published 2026-07-10.
How severe is CVE-2026-56309?: Medium severity. CVSS v3 base score is 5.4 out of 10.