GHSA-644w-64m3-9c8v
Capgo versions before 12.128.2 have a vulnerability in the /files/upload/attachments endpoint where plan and quota restrictions are not enforced. This allows applications blocked by their plan to upload publicly readable R2 objects. Attackers can use upload-scoped API keys to bypass plan checks, upload arbitrary attachments that persist outside normal metadata, and survive app deletion, potentially leading to storage and bandwidth abuse.
AI Analysis
Technical Summary
The vulnerability in Capgo prior to version 12.128.2 involves a failure to enforce plan or quota restrictions on the /files/upload/attachments endpoint. This flaw permits plan-blocked applications to create publicly accessible R2 objects by uploading arbitrary attachments using upload-scoped API keys that circumvent plan validation. These attachments persist beyond normal bundle metadata and remain even after the associated app is deleted, enabling abuse of storage and bandwidth resources. No known exploits are reported in the wild, and no patch or remediation information is currently available.
Potential Impact
Exploitation of this vulnerability allows unauthorized creation of publicly readable objects in R2 storage, bypassing plan restrictions. This can lead to unauthorized storage consumption and bandwidth abuse, potentially incurring costs or service degradation. The persistence of uploaded attachments beyond app deletion increases the risk of resource exhaustion and unauthorized data exposure.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict or monitor the use of upload-scoped API keys and review access controls on the /files/upload/attachments endpoint to limit unauthorized uploads. Avoid using plan-blocked apps for sensitive or high-volume uploads.
GHSA-644w-64m3-9c8v
Description
Capgo versions before 12.128.2 have a vulnerability in the /files/upload/attachments endpoint where plan and quota restrictions are not enforced. This allows applications blocked by their plan to upload publicly readable R2 objects. Attackers can use upload-scoped API keys to bypass plan checks, upload arbitrary attachments that persist outside normal metadata, and survive app deletion, potentially leading to storage and bandwidth abuse.
CVSS v4.0
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Capgo prior to version 12.128.2 involves a failure to enforce plan or quota restrictions on the /files/upload/attachments endpoint. This flaw permits plan-blocked applications to create publicly accessible R2 objects by uploading arbitrary attachments using upload-scoped API keys that circumvent plan validation. These attachments persist beyond normal bundle metadata and remain even after the associated app is deleted, enabling abuse of storage and bandwidth resources. No known exploits are reported in the wild, and no patch or remediation information is currently available.
Potential Impact
Exploitation of this vulnerability allows unauthorized creation of publicly readable objects in R2 storage, bypassing plan restrictions. This can lead to unauthorized storage consumption and bandwidth abuse, potentially incurring costs or service degradation. The persistence of uploaded attachments beyond app deletion increases the risk of resource exhaustion and unauthorized data exposure.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict or monitor the use of upload-scoped API keys and review access controls on the /files/upload/attachments endpoint to limit unauthorized uploads. Avoid using plan-blocked apps for sensitive or high-volume uploads.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-644w-64m3-9c8v
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-56309"]
- Ecosystems
- []
- Database Specific Severity
- MODERATE
- Cvss Version
- 4.0
Threat ID: 6a520eef68715ace4391d6ac
Added to database: 07/11/2026, 09:37:51 UTC
Last enriched: 07/11/2026, 10:10:51 UTC
Last updated: 07/12/2026, 03:33:53 UTC
Views: 8
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