Vulnerability in Capacitor-Updater
CVE-2026-56254
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L.
EPSS exploit prediction
EPSS: 0.002 (8.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 8.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Capacitor-Updater — versions 0, 12.128.2
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-j2f4-4pfc-p8rx (vendor-advisory)
- www.vulncheck.com/advisories/capacitor-updater-end-to-end-encryption-bypass-via… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56254?
- CVE-2026-56254 is a high-severity vulnerability in Capacitor-Updater, classified under CWE-320. CVSS score: 7.0/10. Published 2026-07-10.
- How severe is CVE-2026-56254?
- High severity. CVSS v3 base score is 7.0 out of 10.