CVE-2026-55644

Element X iOS: io.element.call deeplink allows attacker-controlled HTTPS origin and may grant mic/camera to that origin

Published Oct 19, 2026 CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Description
Element X iOS is a Matrix iOS Client provided by Element. Element X iOS before version 26.05.0 fails to check the URL allowlist when parsing io.element.call://. If an attacker is able to trick the user into opening a maliciously crafted io.element.call:// URL, they are able to load an attacker-controlled origin inside the call screen's WKWebView which will be granted device microphone and camera permissions (provided the user has previously granted these permissions to Element X iOS). This issue has been patched in version 26.05.0.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Element-hq
Element-hq element-x-ios
Vendors & Products Element-hq
Element-hq element-x-ios
Type Values Removed Values Added
Description Element X iOS is a Matrix iOS Client provided by Element. Element X iOS before version 26.05.0 fails to check the URL allowlist when parsing io.element.call://. If an attacker is able to trick the user into opening a maliciously crafted io.element.call:// URL, they are able to load an attacker-controlled origin inside the call screen's WKWebView which will be granted device microphone and camera permissions (provided the user has previously granted these permissions to Element X iOS). This issue has been patched in version 26.05.0.
Title Element X iOS: io.element.call deeplink allows attacker-controlled HTTPS origin and may grant mic/camera to that origin
Weaknesses CWE-20
References
Metrics cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Oct 22, 2026, 8:55 PM
Reserved
Jun 16, 2026, 11:52 PM
Status
Deferred
Published
Oct 19, 2026, 6:17 PM
Modified
Oct 22, 2026, 9:17 PM