CVE-2025-54315

Summary

The Matrix specification before 1.16 (i.e., with a room version before 12) lacks create event uniqueness.

Affected Software

Weaknesses

• CWE-837: CWE-837 Improper Enforcement of a Single, Unique Action

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

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

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