How severe is CVE-2022-39254?

This vulnerability has a severity rating of MEDIUM with a CVSS score of 6.5 out of 10.

What type of vulnerability is CVE-2022-39254?

This is classified as CWE-287, which is a common weakness in software security.

CVE-2022-39254

MEDIUM Year: 2022

CVSS v3 Score

6.5

Medium

Weakness Type

CWE-287

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Vulnerability Description

matrix-nio is a Python Matrix client library, designed according to sans I/O principles. Prior to version 0.20, when a users requests a room key from their devices, the software correctly remember the request. Once they receive a forwarded room key, they accept it without checking who the room key came from. This allows homeservers to try to insert room keys of questionable validity, potentially mounting an impersonation attack. Version 0.20 fixes the issue.

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