User Impersonation Affecting matrix-sdk-crypto package, versions >=0.12.0 <0.16.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published11 Jun 2026
- disclosed3 Jun 2026
- creditUnknown
Introduced: 3 Jun 2026
NewCVE-2026-45056 (opens in a new tab)How to fix?
Upgrade matrix-sdk-crypto to version 0.16.1 or higher.
Overview
Affected versions of this package are vulnerable to User Impersonation during the decryption of Olm-encrypted to-device messages containing the sender_device_keys property. An attacker can impersonate another user by sending crafted encrypted messages, but only if the attacker colludes with (or is) the homeserver operator.