CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2019-18835
Critical (9.8) in matrix synapse. EPSS 0.9% chance of exploitation in the next 30 days. Fixed in matrix-synapse 1.5.0.
Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.
Severity
- EPSS
- 0.9% chance of exploitation in the next 30 days; higher than 58% of CVEs (scores of 2026-10-31)
- CWE
- CWE-345
- Published
- Modified
- Record from
- the NVD, synced
Affected
- matrix:synapse
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-cppw-2mf8-qpm5 | PyPI | matrix-synapse | <1.5.0 | 1.5.0 |
| PYSEC-2019-186 | PyPI | matrix-synapse | <1.5.0 | 1.5.0 |