CVE-2026-55644 Details
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.
A vulnerability in Element X iOS versions prior to 26.05.0 allows for improper handling of 'io.element.call://' URLs. This issue arises because the application fails to validate these URLs against an allowlist. As a result, an attacker can craft a malicious URL that, when opened by the user, loads an attacker-controlled website in the call screen's WKWebView. This web view can access the device's microphone and camera, but only if the user has previously granted these permissions to the app.
Users can update to Element X iOS version 26.05.0 or later, which removes support for handling 'io.element.call://' links. Instructions for downloading the latest version are available on the Element X iOS GitHub Releases page.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 19, 2026CISA-ADP
Assessed Oct 22, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/element-hq/element-x-ios/commit/63592e48c1a1e47f75693045efd85a7d4468ea84 | [email protected] | Source CodeVendor |
| https://github.com/element-hq/element-x-ios/pull/5515 | [email protected] | Source CodeVendor |
| https://github.com/element-hq/element-x-ios/releases/tag/release/26.05.0 | [email protected] | Release NotesVendor |
| https://github.com/element-hq/element-x-ios/security/advisories/GHSA-54w7-rw44-49m7 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-20 | Improper Input Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Element X | < 26.05.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 22, 2026 | CVE Modified | CISA-ADP |
| Oct 19, 2026 | New CVE Received | [email protected] |