CVE-2021-40823: Use of a Broken or Risky Cryptographic Algorithm

September 13, 2021 (updated August 8, 2023)

There is a logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK). This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.

References

matrix.org/blog/2021/09/13/vulnerability-disclosure-key-sharing
nvd.nist.gov/vuln/detail/CVE-2021-40823

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