cve.bz

CVE-2018-16515

8.8 highEPSS 1.5%

High (8.8). EPSS 1.5% chance of exploitation in the next 30 days. Fixed in matrix-synapse 0.33.2.1, 0.33.3.1.

Matrix Synapse before 0.33.3.1 allows remote attackers to spoof events and possibly have unspecified other impacts by leveraging improper transaction and event signature validation.

Severity

CVSS 3.0

8.8 high
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
1.5% chance of exploitation in the next 30 days; higher than 74% of CVEs (scores of 2026-10-31)
CWE
CWE-347
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-fmvh-rvq5-hhjxPyPImatrix-synapse>=0.33.3 <0.33.3.10.33.3.1
GHSA-fmvh-rvq5-hhjxPyPImatrix-synapse<0.33.2.10.33.2.1
PYSEC-2026-845PyPImatrix-synapse<0.33.2.1
>=0.33.3 <0.33.3.1		0.33.2.1, 0.33.3.1

References

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