CVE-2026-56254 | In @capgo/capacitor-updater (Cap-go/capgo) before 12.128.2, … | CVSS 7.0 HIGH

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.

Metadata

CVE ID: CVE-2026-56254
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-19 21:56 UTC
Published: 2026-07-10 13:57 UTC
Last updated: 2026-07-10 15:17 UTC
Primary CWE: CWE-320
Key Management Errors
Vendor / Product: capacitor-updater / capacitor-updater
Sources: cve.org · NVD

Severity & Metrics

7.0 HIGH CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
capacitor-updater	capacitor-updater	—	0 < 12.128.2, 12.128.2

Weakness (CWE)

CWE	Source	Description
CWE-320	cna	Key Management Errors

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.3	HIGH	4.0	cna	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
7.0	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L

References (2)

GitHub Security Advisory (GHSA-j2f4-4pfc-p8rx) https://github.com/Cap-go/capgo/security/advisories/GHSA-j2f4-4pfc-p8rx
VulnCheck Advisory: capacitor-updater - End-to-End Encryption Bypass via Private Key Distribution https://www.vulncheck.com/advisories/capacitor-updater-end-to-end-encryption-bypass-via-private-key-distribution