CVE-2026-56254— capacitor-updater - End-to-End Encryption Bypass via Private Key Distribution
Quick assessment
Affected
capacitor-updater capacitor-updater
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Capgo是CAPGO公司的一个专为CapacitorJS开发者打造的移动应用开发和更新平台。 Capgo 12.128.2之前版本存在加密问题漏洞，该漏洞源于端到端加密方案将私钥分发给每个下载应用的设备，且公钥可从私钥推导，导致攻击者执行中间人攻击或攻陷Capgo服务器后可创建有效签名的更新包，使设备安装非原厂更新。
Possible ATT&CK Techniques 2 AI
T1557 · Adversary-in-the-Middle T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| capacitor-updater | capacitor-updater | < 12.128.2 |
affected |
12.128.2 |
unaffected |
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I. Basic Information for CVE-2026-56254
Vulnerability Information
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Vulnerability Title
capacitor-updater - End-to-End Encryption Bypass via Private Key Distribution
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
密钥管理错误
Source: CVE Program / CVE List V5
Vulnerability Title
Capgo 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Capgo是CAPGO公司的一个专为CapacitorJS开发者打造的移动应用开发和更新平台。 Capgo 12.128.2之前版本存在加密问题漏洞，该漏洞源于端到端加密方案将私钥分发给每个下载应用的设备，且公钥可从私钥推导，导致攻击者执行中间人攻击或攻陷Capgo服务器后可创建有效签名的更新包，使设备安装非原厂更新。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| capacitor-updater | capacitor-updater | 0 ~ 12.128.2 | - |
|
II. Public POCs for CVE-2026-56254
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
Qwen3.6-35B-A3B
· 8042 chars
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III. Intelligence Information for CVE-2026-56254
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Vendor Advisories for CVE-2026-56254 (2)
IV. Related Vulnerabilities
Same weakness: CWE-320
V. Comments for CVE-2026-56254
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