Vulnerability-Lookup

CVE-2026-56227 (GCVE-0-2026-56227)

Vulnerability from cvelistv5 – Published: 2026-06-20 15:24 – Updated: 2026-06-22 12:45

Title

Capgo - Server-Side Request Forgery via Webhook URL Validation

Summary

Capgo before 12.128.2 contains a server-side request forgery vulnerability in webhook URL validation that allows loopback and internal addresses. Organization admins can configure webhooks pointing to localhost or 127.0.0.1, and when triggered, the backend performs outbound requests to these addresses with error responses disclosed to users.

Severity

5.3 (Medium)


                        
                          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

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-22 12:44 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/Cap-go/capgo/security/advisori…	vendor-advisory
https://www.vulncheck.com/advisories/capgo-server…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
Capgo	Capgo	Affected: 0 , < 12.128.2 (semver) Unaffected: 12.128.2 (semver)

Date Public

2026-02-10 00:00

Credits

Judel777

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-56227

Vulnerability from fkie_nvd - Published: 2026-06-20 16:17 - Updated: 2026-06-22 18:36

Severity

5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/Cap-go/capgo/security/advisories/GHSA-48hc-53hv-6x3f
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/capgo-server-side-request-forgery-via-webhook-url-validation
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/Cap-go/capgo/security/advisories/GHSA-48hc-53hv-6x3f

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "lastModified": "2026-06-22T18:36:28.807",
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}

GHSA-383X-VH5Q-X2Q9

Vulnerability from github – Published: 2026-06-20 18:31 – Updated: 2026-06-20 18:31

Details

Severity

5.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

5.3 (Medium)


                  
                    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

Show details on source website

JSON

To clipboard

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  "affected": [],
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  ],
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-20T16:17:04Z",
    "severity": "MODERATE"
  },
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  "id": "GHSA-383x-vh5q-x2q9",
  "modified": "2026-06-20T18:31:28Z",
  "published": "2026-06-20T18:31:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Cap-go/capgo/security/advisories/GHSA-48hc-53hv-6x3f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56227"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/capgo-server-side-request-forgery-via-webhook-url-validation"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-56227 (GCVE-0-2026-56227)

FKIE_CVE-2026-56227

GHSA-383X-VH5Q-X2Q9

Tags

Sightings

Nomenclature