VulnerabilityModified
CVE-2019-18835
Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs.
CRITICAL 9.8EPSS 0.86%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.86%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.86% probability · 57th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-345
- Affected
- matrix/synapse
- Source
- cve@mitre.org
References
- https://github.com/matrix-org/synapse/pull/6262Patch, Third Party Advisory
- https://github.com/matrix-org/synapse/releases/tag/v1.5.0Release Notes, Third Party Advisory
- https://github.com/matrix-org/synapse/pull/6262Patch, Third Party Advisory
- https://github.com/matrix-org/synapse/releases/tag/v1.5.0Release Notes, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.