CVE-2026-56309 | Capgo before 12.128.2 fails to enforce plan/quota restrictio… | CVSS 5.4 MEDIUM

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.

Metadata

CVE ID: CVE-2026-56309
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-20 12:53 UTC
Published: 2026-07-10 13:57 UTC
Last updated: 2026-07-10 15:12 UTC
Primary CWE: CWE-770
Allocation of Resources Without Limits or Throttling
Vendor / Product: Capgo / Capgo
Sources: cve.org · NVD

Severity & Metrics

5.4 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
Capgo	Capgo	—	0 < 12.128.2, 12.128.2

Weakness (CWE)

CWE	Source	Description
CWE-770	cna	Allocation of Resources Without Limits or Throttling

CVSS scores (2)

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

References (2)

GitHub Security Advisory (GHSA-q52j-ggvx-cr4v) https://github.com/Cap-go/capgo/security/advisories/GHSA-q52j-ggvx-cr4v
VulnCheck Advisory: Capgo - Plan Bypass via Unrestricted Attachment Upload Endpoint https://www.vulncheck.com/advisories/capgo-plan-bypass-via-unrestricted-attachment-upload-endpoint