CVE-2019-18835
CRITICAL
9.8
CVSS Score
Published: November 7, 2019 at 11:12 PM UTC
Updated: June 17, 2026 at 02:25 AM UTC
1 product affected across 1 vendorSynapse
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Severity
CRITICAL9.8
Exploit prediction
EPSS 0.9%
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.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (2)
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/matrix-org/synapse/pull/6262x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/matrix-org/synapse/releases/tag/v1.5.0CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-345
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