CVE-2026-56254 capacitor-updater - End-to-End Encryption Bypass via Private Key Distribution
Attackers can bypass end-to-end encryption to install malicious updates on mobile devices by exploiting private key distribution flaws in the Capacitor updater plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56254?
CVE-2026-56254 is a high-severity vulnerability in capacitor-updater, published on 10 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-320
Which versions are affected by CVE-2026-56254?
How do I fix CVE-2026-56254?
No fix has been published for CVE-2026-56254 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-56254 being exploited?
There is no known exploitation of CVE-2026-56254 in the wild and no public exploit code.
Sources
Also known as GHSA-j2f4-4pfc-p8rx, GHSA-v24w-qp6p-4wjw.