capgo capacitor-updater up to 12.128.1 End-to-End Encryption Scheme channel accessible

Summaryinfo

A vulnerability was found in capgo capacitor-updater up to 12.128.1. It has been rated as critical. This affects an unknown part of the component End-to-End Encryption Scheme. The manipulation leads to channel accessible. This vulnerability is traded as CVE-2026-56254. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in capgo capacitor-updater up to 12.128.1. This issue affects an unknown function of the component End-to-End Encryption Scheme. The manipulation with an unknown input leads to a channel accessible vulnerability. Using CWE to declare the problem leads to CWE-300. The product does not adequately verify the identity of actors at both ends of a communication channel, or does not adequately ensure the integrity of the channel, in a way that allows the channel to be accessed or influenced by an actor that is not an endpoint. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-56254 since 06/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1557 for this issue.

Upgrading to version 12.128.2 eliminates this vulnerability.

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Productinfo

Vendor

• capgo

Name

• capacitor-updater

Version

• 12.128.0
• 12.128.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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