CVE-2026-103922: Capacitor Android and iOS: remote content can be loaded at the app origin via the internal HTTP proxy path

Severity: critical (CVSS 9.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-01 · updated 2026-10-02
Weakness: CWE-346

Description

Capacitor is a cross-platform native runtime for web applications. From 6.0.0 until 6.2.2, 7.6.9, 8.3.5, 8.4.3, and 8.5.1, the Android and iOS WebView navigation guard validates a target URL's host and scheme but not its path, allowing a victim who activates an untrusted link to navigate a frame to /_capacitor_http_interceptor_. The native proxy can fetch an attacker-selected URL and return the response as a document at the application's own origin, allowing script in that response to access same-origin storage, cookies, and registered Capacitor plugin capabilities. Applications remain affected when CapacitorHttp is disabled because affected releases serve the proxy path regardless of that setting. This issue is fixed in versions 6.2.2, 7.6.9, 8.3.5, 8.4.3, and 8.5.1.

Affected products

swift github.com/ionic-team/capacitor-swift-pm: from 8.5.0, < 8.5.1; from 8.3.5, < 8.4.3; from 8.0.0, < 8.3.5; from 7.0.0, < 7.6.9; from 6.0.0, < 6.2.2
@capacitor android: from 8.5.0, < 8.5.1; from 8.3.5, < 8.4.3; from 8.0.0, < 8.3.5; from 7.0.0, < 7.6.9; from 6.0.0, < 6.2.2
@capacitor ios: from 8.5.0, < 8.5.1; from 8.3.5, < 8.4.3; from 8.0.0, < 8.3.5; from 7.0.0, < 7.6.9; from 6.0.0, < 6.2.2
com.capacitorjs core: from 8.5.0, < 8.5.1; from 8.3.5, < 8.4.3; from 8.0.0, < 8.3.5; from 7.0.0, < 7.6.9; from 6.0.0, < 6.2.2
ionic-team capacitor: from 6.0.0, < 6.2.2; from 7.0.0, < 7.6.9; from 8.0.0, < 8.3.5; from 8.3.5, < 8.4.3; from 8.5.0, < 8.5.1

References

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