Vulnerability · Published Jul 10, 2026 · Assigned by VulnCheck

CVE-2026-56254capacitor-updater - End-to-End Encryption Bypass via Private Key Distribution

High 7.0

In plain English

A high-severity security flaw in capacitor-updater from capacitor-updater. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).

Severity (CVSS 3.1)7.0High

Exploit odds (30 days)0.2%top 90.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
capacitor-updater	capacitor-updater	0 – before 12.128.2

Weakness: CWE-320 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

References

GitHub Security Advisory (GHSA-j2f4-4pfc-p8rx) vendor-advisory
VulnCheck Advisory: capacitor-updater - End-to-End Encryption Bypass via Private Key Distribution third-party-advisory