PYSEC-2026-194

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This...

PYSEC-2026-194

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This...

CVE-2026-45076 Synapse pagination denial of service

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This...

EUVD-2026-32934

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This...

CVE-2026-45076

Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, in federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. This...

Synapse pagination Denial of Service

Impact In federated rooms, malicious homeservers can craft room events in such a way that prevents Synapse from providing full history to paginating clients. Clients could therefore fail to display room history. Patches Update to Synapse 1.152.1 or later. Workarounds There are no known workaround...

PT-2026-41158

Name of the Vulnerable Software and Affected Versions Synapse versions prior to 1.152.1 Description In federated rooms, malicious homeservers can craft room events that prevent the server from providing full history to paginating clients. This can result in clients failing to display the room...

CVE-2026-28471 OpenClaw 2026.1.14-1 < 2026.2.2 - Allowlist Bypass via displayName and Cross-Homeserver localpart Matching in Matrix Plugin

OpenClaw version 2026.1.14-1 prior to 2026.2.2, with the Matrix plugin installed and enabled, contain a vulnerability in which DM allowlist matching could be bypassed by exact-matching against sender display names and localparts without homeserver validation. Remote Matrix users can impersonate...

EUVD-2021-0119

Malware in sbrugna...

GHSA-QCVH-P9JQ-WP8V Malicious homeservers can steal message keys when the matrix-react-sdk user invites another user to a room

Impact matrix-react-sdk before 3.102.0 allows a malicious homeserver to potentially steal message keys for a room when a user invites another user to that room, via injection of a malicious device controlled by the homeserver. This is possible because matrix-react-sdk before 3.102.0 shared...

CVE-2024-47080 matrix-js-sdk keys sent via `sendSharedHistoryKeys` vulnerable to interception by malicious homeserver

matrix-js-sdk is the Matrix Client-Server SDK for JavaScript and TypeScript. In matrix-js-sdk versions versions 9.11.0 through 34.7.0, the method MatrixClient.sendSharedHistoryKeys is vulnerable to interception by malicious homeservers. The method was introduced by MSC3061 and is commonly used to...

CVE-2024-47080

matrix-js-sdk is the Matrix Client-Server SDK for JavaScript and TypeScript. In matrix-js-sdk versions versions 9.11.0 through 34.7.0, the method MatrixClient.sendSharedHistoryKeys is vulnerable to interception by malicious homeservers. The method was introduced by MSC3061 and is commonly used to...

PT-2024-7389 · Unknown +1 · Matrix-Js-Sdk +1

Name of the Vulnerable Software and Affected Versions: matrix-js-sdk versions 9.11.0 through 34.7.0 Description: The issue is related to the MatrixClient.sendSharedHistoryKeys method in the matrix-js-sdk, which is vulnerable to interception by malicious homeservers. This method is used to share...

Fedora 37 : matrix-synapse / python-matrix-common / rust-pythonize (2023-c0696d7b53)

The remote Fedora 37 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2023-c0696d7b53 advisory. Update matrix-synapse to v1.80.0 to fix CVE-2022-39374, CVE-2023-32323 Tenable has extracted the preceding description block directly from the Fedor...

CVE-2022-39335 Synapse does not apply enough checks to servers requesting auth events of events in a room

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are...

Man-in-the-Middle (MitM)

nheko is vulnerable to man-in-the-middle MitM attacks. The library homeservers inserting malicious secrets, allows remote attackers to cause man-in-the-middle attacks...

UBUNTU-CVE-2022-39254

matrix-nio is a Python Matrix client library, designed according to sans I/O principles. Prior to version 0.20, when a users requests a room key from their devices, the software correctly remember the request. Once they receive a forwarded room key, they accept it without checking who the room ke...

PT-2022-24845 · Unknown · Matrix-Rust-Sdk

Name of the Vulnerable Software and Affected Versions: matrix-rust-sdk versions prior to 0.6 Description: The issue arises when a user requests a room key from their devices. The software correctly remembers the request but fails to check the origin of the forwarded room key, allowing homeservers...

Design/Logic Flaw

Dendrite is a Matrix homeserver written in Go. In affected versions events retrieved from a remote homeserver using the /getmissingevents path did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this...

dendrite -- Signature checks not applied to some retrieved missing events

Dendrite team reports: Events retrieved from a remote homeserver using /getmissingevents did not have their signatures verified correctly. This could potentially allow a remote homeserver to provide invalid/modified events to Dendrite via this endpoint. Note that this does not apply to events...