High severity · published Oct 2, 2025
CVE-2025-54315
The Matrix specification before 1.16 (i.e., with a room version before 12) lacks create event uniqueness
7.1
CVSS
0.3%
EPSS
No
On KEV
Description
The Matrix specification before 1.16 (i.e., with a room version before 12) lacks create event uniqueness.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:L
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 27% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MS
Matrix specification · Matrix
before 1.16 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-54315
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-54315
github.com
https://github.com/matrix-org/matrix-spec/releases/tag/v1.16
matrix.org
https://matrix.org/blog/2025/08/project-hydra-improving-state-res/
More from Matrix specification
7.1
CVE-2025-49090
The Matrix specification before 1.16 (i.e., with a room version before 12 and State Resolution before 2.1) has deficient state resolution