EUVD-2026-42883
GHSA-644w-64m3-9c8v
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network API accessible with a low-privilege upload-scoped key; no scope change, confidentiality breach, or user interaction; limited integrity and availability impact via storage quota bypass.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Plan quota enforcement is missing on the /files/upload/attachments endpoint in Capgo before 12.128.2, allowing upload-scoped API keys to bypass plan restrictions and create publicly readable Cloudflare R2 objects regardless of account standing. Apps that have been plan-blocked or suspended retain the ability to upload arbitrary attachments that persist outside bundle metadata and survive app deletion, enabling sustained storage and bandwidth abuse against the Capgo platform. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires possession of a valid upload-scoped API key for a Capgo application - the specific credential type scoped to the /files/upload/attachments endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) places this as network-accessible with low complexity and low privilege requirements - a valid upload-scoped API key is sufficient. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker whose Capgo app has been plan-blocked retains a previously issued upload-scoped API key and sends crafted multipart upload requests directly to the /files/upload/attachments endpoint, bypassing plan enforcement and writing arbitrary files as publicly readable objects to Cloudflare R2 storage. Because the uploaded objects persist outside bundle metadata and survive app deletion, the attacker can accumulate significant storage and bandwidth consumption at Capgo's expense with no ongoing account relationship required. … |
| Remediation | Upgrade Capgo to version 12.128.2 or later, which enforces proper plan and quota restrictions on the /files/upload/attachments endpoint per the vendor advisory at https://github.com/Cap-go/capgo/security/advisories/GHSA-q52j-ggvx-cr4v. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Denial Of Service
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External POC / Exploit Code
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