CVE-2025-31127: Element X Android allows the entity in control of the well-known file to break the confidentiality embedded Element Call

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-04-03 · updated 2026-06-17
Weakness: CWE-200

Description

Element X Android is a Matrix Android Client provided by element.io. In Element X Android versions between 0.4.16 and 25.03.3, the entity in control of the element.json well-known file is able, under certain conditions, to get access to the media encryption keys used for an Element Call call. This vulnerability is fixed in 25.03.4.

Affected products

element-hq element-x-android: from 0.4.16, < 25.03.4

References

https://github.com/element-hq/element-meta/issues/2441
https://github.com/element-hq/element-x-android/security/advisories/GHSA-x2g5-f28j-p7w6

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