What’s Vulnerable › Vulnerabilities

CVE-2025-54315

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-02 · updated 2026-10-12
• Weakness: CWE-837

Description

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

Affected products

• Matrix specification: before 1.16 — fixed in 1.16

How to fix

Upgrade to a fixed version: Matrix specification 1.16. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2025-54315 or the next vulnerability affects your stack