PatchSiren cyber security CVE debrief
CVE-2026-56243 Capgo CVE debrief
CVE-2026-56243 is a security control bypass vulnerability in Capgo before 12.128.2. The PostgREST/RLS plane accepts plaintext API keys through the capgkey header despite enforce_hashed_api_keys being enabled. This allows attackers to bypass org-level hashed-key enforcement by sending plaintext API keys directly to the PostgREST/RLS plane to access protected resources. The vulnerability has a CVSS score of 8.6 and is classified as HIGH severity. The CVE was published on June 23, 2026, and last modified on the same day.
- Vendor
- Capgo
- Product
- Unknown
- CVSS
- HIGH 8.6
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-23
- Original CVE updated
- 2026-06-23
- Advisory published
- 2026-06-23
- Advisory updated
- 2026-06-23
Who should care
Organizations using Capgo before version 12.128.2 should be aware of this vulnerability and take immediate action to mitigate the risk. The vulnerability allows attackers to bypass hashed API key enforcement, potentially leading to unauthorized access to protected resources. Security teams and administrators responsible for Capgo deployments should prioritize patching to version 12.128.2 or later.
Technical summary
The vulnerability exists in the PostgREST/RLS plane of Capgo, where it fails to enforce hashed API keys when the enforce_hashed_api_keys setting is enabled. Attackers can exploit this by sending plaintext API keys in the capgkey header, effectively bypassing org-level security controls. This could lead to unauthorized access to sensitive resources. The issue is addressed in Capgo version 12.128.2.
Defensive priority
High priority should be given to patching Capgo to version 12.128.2 or later. In the interim, defenders should closely monitor API key usage and consider implementing additional security controls to mitigate the risk of unauthorized access.
Recommended defensive actions
- Patch Capgo to version 12.128.2 or later
- Monitor API key usage for suspicious activity
- Implement additional security controls to mitigate unauthorized access
- Review and update security policies to ensure proper API key management
- Conduct a thorough inventory of affected systems and prioritize patching
Evidence notes
The CVE record and NVD detail provide official information about the vulnerability. Additional sources, including GitHub advisories and Vulncheck advisories, offer further context and details about the issue. The evidence suggests that the vulnerability is real and has been addressed in Capgo version 12.128.2.
Official resources
This article is AI-assisted and based on the supplied source corpus.