CVE-2026-103922 Capacitor - Stored XSS

Capacitor 6.0.0 to 6.2.2, 7.6.9, 8.3.5, 8.4.3, and 8.5.1 contain a stored XSS caused by insufficient validation of WebView navigation guard path, letting attackers execute scripts with same-origin access, exploit requires victim to activate an untrusted link.

CVSS base score 9.3 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Stored XSS
Impact
Client Script Exec, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-346

Vendor fix

Update to versions 6.2.2, 7.6.9, 8.3.5, 8.4.3, or 8.5.1.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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