Vulnerability-Lookup

CVE-2026-56296 (GCVE-0-2026-56296)

Vulnerability from cvelistv5 – Published: 2026-07-11 13:00 – Updated: 2026-07-13 15:19

Title

Cap-go - App Existence Oracle via Unauthenticated transfer_app RPC

Summary

Cap-go before 12.128.2 contains an information disclosure vulnerability in the public.transfer_app RPC function that returns distinct error messages for existing versus non-existing app IDs. Unauthenticated attackers can enumerate valid app IDs by observing error message differences when calling transfer_app with only the publishable API key.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

5.3 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-13 15:19 UTC

CWE

CWE-203 - Observable Discrepancy

Assigner

VulnCheck mitre root

References

2 references

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

Impacted products

1 product

Vendor	Product	Version	CPE status
Cap-go	capgo	Affected: 0 , < 12.128.2 (semver) Unaffected: 12.128.2 (semver)	guessed

Date Public

2026-03-03 00:00

Credits

Judel777

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-56296

Vulnerability from fkie_nvd - Published: 2026-07-11 14:16 - Updated: 2026-07-13 18:12

Severity

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

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/Cap-go/capgo/security/advisories/GHSA-fmm3-3qcg-85j6
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/cap-go-app-existence-oracle-via-unauthenticated-transfer-app-rpc
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/Cap-go/capgo/security/advisories/GHSA-fmm3-3qcg-85j6

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
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          "defaultStatus": "unaffected",
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  "lastModified": "2026-07-13T18:12:29.917",
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  "vulnStatus": "Deferred",
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}

GHSA-FCMV-MQRC-FR3C

Vulnerability from github – Published: 2026-07-11 15:30 – Updated: 2026-07-11 15:30

Details

Severity

5.3 (Medium)


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

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

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  "affected": [],
  "aliases": [
    "CVE-2026-56296"
  ],
  "database_specific": {
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      "CWE-203"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-11T14:16:21Z",
    "severity": "MODERATE"
  },
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  "id": "GHSA-fcmv-mqrc-fr3c",
  "modified": "2026-07-11T15:30:21Z",
  "published": "2026-07-11T15:30:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Cap-go/capgo/security/advisories/GHSA-fmm3-3qcg-85j6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56296"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/cap-go-app-existence-oracle-via-unauthenticated-transfer-app-rpc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-56296 (GCVE-0-2026-56296)

FKIE_CVE-2026-56296

GHSA-FCMV-MQRC-FR3C

Tags

Sightings

Nomenclature

Related by attack behaviour