capacitor-updater - End-to-End Encryption Bypass via Private Key Distribution
Priority LOW 35CWE-320Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · High · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00195 9th percentileScored 2026-11-07
Fix Fixed capacitor-updater (capacitor-updater): 12.128.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| capacitor-updater | capacitor-updater | before 12.128.2 | 12.128.2 | Patch available | CNA |
- capacitor-updater Vendorcapacitor-updater Affected before 12.128.2 Fixed in 12.128.2 Patch available CNA
Remediation
- Fix · CNA capacitor-updater (capacitor-updater) Fixed in 12.128.2
Timeline
- 2026-10-02 Threatist record created from CVE-2026-56254
- 2026-10-03 Alias added: GHSA-v24w-qp6p-4wjw
References
Sources
- CVE-2026-56254 · CVE Program
- CVE-2026-56254 · NVD
- FIRST EPSS
- GHSA-v24w-qp6p-4wjw · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences