CVE-2025-54315: The Matrix specification before 1.16 (i.e., with a room version before 12) lacks create event uniqueness.

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

7.1 CVSS 3.1 High EPSS 0.33% · top 76.4% CWE-837 · CWE-837 Deferred

7.1CVSS 3.1 base score

0.33%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

2References

17 Jun 2026Last modified by NVD

Description

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

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L

References

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

Track CVE-2025-54315 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Source: NIST National Vulnerability Database (record CVE-2025-54315), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.