CVE-2026-55644

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.

CVSS 4.0

5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

EPSS

0.4% chance of exploitation in the next 30 days; higher than 31% of CVEs (scores of 2026-10-25)

CWE

CWE-20

Published

2026-10-19

Modified

2026-10-22

Record from

the NVD, synced 2026-10-23

References

• https://github.com/element-hq/element-x-ios/commit/63592e48c1a1e47f75693045efd85a7d4468ea84
• https://github.com/element-hq/element-x-ios/pull/5515
• https://github.com/element-hq/element-x-ios/releases/tag/release/26.05.0
• https://github.com/element-hq/element-x-ios/security/advisories/GHSA-54w7-rw44-49m7

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