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PatchSiren cyber security CVE debrief

CVE-2026-56227 Capgo CVE debrief

CVE-2026-56227 is a medium-severity server-side request forgery (SSRF) vulnerability in Capgo versions before 12.128.2. The issue arises from inadequate webhook URL validation, permitting organization admins to configure webhooks pointing to localhost or 127.0.0.1. When triggered, the backend performs outbound requests to these addresses, disclosing error responses to users. Defenders should assess their exposure, focusing on webhook configurations and potential internal network impacts. Given the medium CVSS score of 5.3, this issue warrants attention but may not require immediate action unless specific organizational risks are present.

Vendor
Capgo
Product
Unknown
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-20
Original CVE updated
2026-06-22
Advisory published
2026-06-20
Advisory updated
2026-06-22

Who should care

IT administrators and security teams managing Capgo instances, especially those with webhook configurations pointing to internal addresses, should evaluate their exposure and consider updating to version 12.128.2 or later. Additionally, organizations using Capgo for internal services or with high-security requirements should prioritize assessment and mitigation.

Technical summary

The CVE-2026-56227 vulnerability in Capgo allows for SSRF attacks due to insufficient validation of webhook URLs. This could enable attackers to manipulate internal services, potentially leading to unauthorized data access or service disruption. The vulnerability's CVSS vector is CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:L/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, indicating a medium severity level.

Defensive priority

Medium priority due to potential for internal network exploitation

Recommended defensive actions

  • Inventory Capgo instances and verify webhook configurations
  • Review and restrict webhook URLs to prevent internal address access
  • Update Capgo to version 12.128.2 or later
  • Monitor for suspicious outbound requests from Capgo instances
  • Implement compensating controls for internal services if updating is not feasible

Evidence notes

The primary evidence for this vulnerability comes from the NVD and CVE.org records. The vulnerability affects Capgo versions before 12.128.2. Defenders should verify webhook configurations and assess potential internal network impacts. Evidence limits suggest focusing on official advisories and vendor documentation for detailed mitigation steps.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56227 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56227

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

  • CVE-2026-56227 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56227

    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.