Detections
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SCA: security update for matrix-synapse (GHSA-hxmp-pqch-c8mm)

high Tenable Cloud Security Plugin ID 416034

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Matrix is an ecosystem for open federated Instant Messaging and VoIP. Synapse is a reference "homeserver"
 implementation of Matrix. A malicious or poorly-implemented homeserver can inject malformed events into a
 room by specifying a different room id in the path of a `/send_join`, `/send_leave`, `/invite` or
 `/exchange_third_party_invite` request. This can lead to a denial of service in which future events will
 not be correctly sent to other servers over federation. This affects any server which accepts federation
 requests from untrusted servers. The Matrix Synapse reference implementation before version 1.23.1 the
 implementation is vulnerable to this injection attack. Issue is fixed in version 1.23.1. As a workaround
 homeserver administrators could limit access to the federation API to trusted servers (for example via
 `federation_domain_whitelist`). (CVE-2020-26257)

See Also

https://github.com/advisories/GHSA-hxmp-pqch-c8mm

Plugin Details

Severity: High

ID: 416034

Version: Revision 1.5

Type: Local

Family: SCA Checks

Published: 1/23/2025

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.18

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:P

CVSS Score Source: CVE-2020-26257

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 7.1

Threat Score: 4.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 12/9/2020

Vulnerability Publication Date: 12/9/2020

Reference Information

CVE: CVE-2020-26257