PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-56234 Capgo CVE debrief

CVE-2026-56234 is a credential validation vulnerability in Capgo, a vulnerability that allows attackers to perform password spraying and credential stuffing attacks. The vulnerability exists in the POST /functions/v1/private/validate_password_compliance endpoint, which is callable using only the public Supabase key without authentication. The endpoint is CORS-permissive with wildcard origin allowance and lacks rate limiting. This vulnerability has a CVSS score of 6.9 and a severity of MEDIUM. To address this vulnerability, defenders should prioritize patching and updating Capgo to version 12.128.2 or later. Additionally, defenders should monitor for suspicious activity and implement compensating controls to prevent exploitation.

Vendor
Capgo
Product
Unknown
CVSS
MEDIUM 6.9
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 should prioritize patching and updating to version 12.128.2 or later to prevent exploitation of this vulnerability. Additionally, defenders should monitor for suspicious activity and implement compensating controls to prevent exploitation. Security teams should also review their inventory of Capgo instances to ensure they are up-to-date and not vulnerable.

Technical summary

The vulnerability exists in the POST /functions/v1/private/validate_password_compliance endpoint of Capgo, which is callable using only the public Supabase key without authentication. The endpoint is CORS-permissive with wildcard origin allowance and lacks rate limiting, allowing attackers to perform password spraying and credential stuffing attacks. The vulnerability has a CVSS score of 6.9 and a severity of MEDIUM. The CVE record and NVD detail provide additional information about the vulnerability.

Defensive priority

Defenders should prioritize patching and updating Capgo to version 12.128.2 or later to prevent exploitation of this vulnerability. Additionally, defenders should monitor for suspicious activity and implement compensating controls to prevent exploitation.

Recommended defensive actions

  • Patch or update Capgo to version 12.128.2 or later
  • Monitor for suspicious activity
  • Implement compensating controls to prevent exploitation
  • Review inventory of Capgo instances to ensure they are up-to-date and not vulnerable
  • Implement rate limiting on the POST /functions/v1/private/validate_password_compliance endpoint

Evidence notes

The CVE record and NVD detail provide additional information about the vulnerability. The source item URL provides additional metadata about the vulnerability. The source references provide additional information about the vulnerability and its impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56234 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56234

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-56234 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56234

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.