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Insufficient Verification of Data Authenticity

CVE-2019-18835

Severity High
Score 9.8/10

Summary

Matrix Synapse before 1.5.0rc2 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.

  • LOW
  • NETWORK
  • HIGH
  • UNCHANGED
  • NONE
  • NONE
  • HIGH
  • HIGH

CWE-345 - Insufficient Verification of Data Authenticity

The software does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

Advisory Timeline

  • Published