Vulnerability · Published Oct 19, 2026 · Assigned by GitHub_M
CVE-2026-55644Element X iOS: io.element.call deeplink allows attacker-controlled HTTPS origin and may grant mic/camera to that origin
Medium 5.1
In plain English
A medium-severity improper input validation in element-x-ios from element-hq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| element-hq | element-x-ios | < 26.05.0 |
Weakness: CWE-20 · 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
References
- https://github.com/element-hq/element-x-ios/security/advisories/GHSA-54w7-rw44-49m7 x_refsource_CONFIRM
- https://github.com/element-hq/element-x-ios/pull/5515 x_refsource_MISC
- https://github.com/element-hq/element-x-ios/commit/63592e48c1a1e47f75693045efd85a7d4468ea84 x_refsource_MISC
- https://github.com/element-hq/element-x-ios/releases/tag/release/26.05.0 x_refsource_MISC