Event Uniqueness Vulnerability in Matrix Product by Matrix Org
CVE-2025-54315

7.1HIGH

Key Information:

Vendor

Matrix

Status
Matrix Specification
Vendor
CVE Published:
2 October 2025

What is CVE-2025-54315?

A vulnerability exists in the Matrix specification prior to version 1.16, where the lack of uniqueness for create events could lead to event conflicts and integrity issues within the system. This can potentially allow for manipulation of state and improper handling of user interactions. For continued security and functionality, users should upgrade to the latest version.

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Affected Version(s)

Matrix specification 0 < 1.16

References

https://github.com/matrix-org/matrix-spec/releases/tag/v1.16
https://matrix.org/blog/2025/08/project-hydra-improving-s...

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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