EUVD-2026-40439
GHSA-g8vq-gjgw-gfc8
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable management API with low complexity, but requires authorized channel-manager privileges (PR:L); impact is integrity-only routing manipulation, so C:N/A:N.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
Capgo before 12.128.2 allows multiple public channels for the same app and platform to coexist simultaneously, while unnamed /updates requests without defaultChannel implicitly resolve to a single hidden winner channel. An authorized app or channel manager can create ambiguous default update state and silently influence which bundle unnamed clients receive, breaking release routing integrity and predictability.
AnalysisAI
Release-routing integrity failure in Capgo before 12.128.2 lets an authorized app or channel manager covertly steer which update bundle unnamed clients receive. Because the platform permits multiple public channels per app/platform to coexist and silently resolves channel-less /updates requests to a single hidden 'winner' channel, a low-privileged insider can manipulate default update state and serve a chosen bundle to clients that did not specify a channel. There is no public exploit identified at time of analysis, and the issue is not in CISA KEV.
Technical ContextAI
Capgo is a live (over-the-air) update service for Capacitor-based mobile apps, distributing JavaScript/asset bundles to deployed apps through named 'channels' (e.g. production, beta). Clients poll an /updates endpoint to learn which bundle to download. The flaw is rooted in CWE-670 (Always-Incorrect Control Flow Implementation): the routing logic allows several channels to be marked public/default for the same app and platform at once, and when a client requests updates without specifying a defaultChannel, the backend deterministically but opaquely picks one channel as the implicit winner. The affected component is the Capgo backend release-routing logic, identified by CPE cpe:2.3:a:capgo:capgo:*:*:*:*:*:*:*:*, with all versions prior to 12.128.2 affected.
RemediationAI
Vendor-released patch: upgrade to Capgo 12.128.2 or later, which corrects the release-routing logic so default/public channel resolution is unambiguous. As compensating controls until upgrade, avoid configuring more than one public/default channel per app and platform combination, and require clients to specify an explicit defaultChannel on /updates requests so routing no longer depends on the implicit hidden-winner selection - the trade-off is that every client build and update call must be audited to pin its channel, which adds configuration overhead. Additionally, tighten the set of accounts holding app/channel-manager privileges and audit channel-configuration changes, since the vulnerability is abusable only by such authorized roles. Reference the vendor advisory GHSA-3cmp-pm5x-8464 (https://github.com/Cap-go/capgo/security/advisories/GHSA-3cmp-pm5x-8464) for full details.
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External POC / Exploit Code
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