Vulnerability-Lookup

CVE-2026-56254 (GCVE-0-2026-56254)

Vulnerability from cvelistv5 – Published: 2026-07-10 13:57 – Updated: 2026-07-10 15:17

Title

capacitor-updater - End-to-End Encryption Bypass via Private Key Distribution

Summary

In @capgo/capacitor-updater (Cap-go/capgo) before 12.128.2, the end-to-end encryption scheme distributes the private key to each device that downloads the app. Because the public key can be derived from the private key, an attacker performing a man-in-the-middle attack or compromising the Capgo server can create a validly signed update bundle and cause devices to install an update not produced by the original app maker.

Severity

8.3 (High)


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

7 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-320 - Key Management Errors

Assigner

VulnCheck

References

2 references

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

Impacted products

1 product

Vendor	Product	Version
capacitor-updater	capacitor-updater	Affected: 0 , < 12.128.2 (semver) Unaffected: 12.128.2 (semver)

Date Public

2026-02-10 00:00

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-56254

Vulnerability from fkie_nvd - Published: 2026-07-10 15:16 - Updated: 2026-07-10 16:16

Severity

7.0 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/Cap-go/capgo/security/advisories/GHSA-j2f4-4pfc-p8rx
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/capacitor-updater-end-to-end-encryption-bypass-via-private-key-distribution

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/capgo/capacitor-updater",
          "product": "capacitor-updater",
          "vendor": "capacitor-updater",
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              "version": "0",
              "versionType": "semver"
            },
            {
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              "version": "12.128.2",
              "versionType": "semver"
            }
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    }
  ],
  "id": "CVE-2026-56254",
  "lastModified": "2026-07-10T16:16:33.713",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "HIGH",
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          "baseScore": 7.0,
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          "confidentialityImpact": "LOW",
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}

GHSA-V24W-QP6P-4WJW

Vulnerability from github – Published: 2026-07-10 15:31 – Updated: 2026-07-10 15:31

Details

Severity

7.0 (High)


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

8.3 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-56254"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-10T15:16:41Z",
    "severity": "HIGH"
  },
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  "id": "GHSA-v24w-qp6p-4wjw",
  "modified": "2026-07-10T15:31:39Z",
  "published": "2026-07-10T15:31:39Z",
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    {
      "type": "WEB",
      "url": "https://github.com/Cap-go/capgo/security/advisories/GHSA-j2f4-4pfc-p8rx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56254"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/capacitor-updater-end-to-end-encryption-bypass-via-private-key-distribution"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/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.

Action not permitted

CVE-2026-56254 (GCVE-0-2026-56254)

FKIE_CVE-2026-56254

GHSA-V24W-QP6P-4WJW

Tags

Sightings

Nomenclature