Matrix Synapse vulnerabilities

CVE-2025-30355 [HIGH] CWE-20 CVE-2025-30355: Synapse is an open source Matrix homeserver implementation. A malicious server can craft events whic Synapse is an open source Matrix homeserver implementation. A malicious server can craft events which, when received, prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild and has been fixed in Synapse v1.127.1. No known workarounds are available.

CVE-2024-37302 [HIGH] CWE-770 CVE-2024-37302: Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media upl

CVE-2024-52815 [HIGH] CWE-20 CVE-2024-52815: Synapse is an open-source Matrix homeserver. Synapse versions before 1.120.1 fail to properly valida Synapse is an open-source Matrix homeserver. Synapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync functionality. Synapse 1.120.1 rejects such invalid invites received over federation and restores

CVE-2024-53863 [HIGH] CWE-434 CVE-2024-53863: Synapse is an open-source Matrix homeserver. In Synapse versions before 1.120.1, enabling the dynami Synapse is an open-source Matrix homeserver. In Synapse versions before 1.120.1, enabling the dynamic_thumbnails option or processing a specially crafted request could trigger the decoding and thumbnail generation of uncommon image formats, potentially invoking external tools like Ghostscript for processing. This significantly expands the attack surfa

CVE-2024-52805 [HIGH] CWE-770 CVE-2024-52805: Synapse is an open-source Matrix homeserver. In Synapse before 1.120.1, multipart/form-data requests Synapse is an open-source Matrix homeserver. In Synapse before 1.120.1, multipart/form-data requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial of service attacks. Synapse 1.120.1 resolves the issue by denying requests with unsupported m

CVE-2024-37303 [MEDIUM] CWE-306 CVE-2024-37303: Synapse is an open-source Matrix homeserver. Synapse before version 1.106 allows, by design, unauthe Synapse is an open-source Matrix homeserver. Synapse before version 1.106 allows, by design, unauthenticated remote participants to trigger a download and caching of remote media from a remote homeserver to the local media repository. Such content then also becomes available for download from the local homeserver in an unauthenticated way. The impli

CVE-2024-31208 [MEDIUM] CWE-770 CVE-2024-31208: Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a r Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the database of such instances, resultin

CVE-2023-43796 [MEDIUM] CWE-200 CVE-2023-43796: Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device in Synapse is an open-source Matrix homeserver Prior to versions 1.95.1 and 1.96.0rc1, cached device information of remote users can be queried from Synapse. This can be used to enumerate the remote users known to a homeserver. System administrators are encouraged to upgrade to Synapse 1.95.1 or 1.96.0rc1 to receive a patch. As a workaround, the `feder

CVE-2023-45129 [MEDIUM] CWE-770 CVE-2023-45129: Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Pri Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, a malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affect

CVE-2023-42453 [MEDIUM] CWE-285 CVE-2023-42453: Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Use Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Users were able to forge read receipts for any event (if they knew the room ID and event ID). Note that the users were not able to view the events, but simply mark it as read. This could be confusing as clients will show the event as read by the user, ev

CVE-2023-41335 [LOW] CWE-312 CVE-2023-41335: Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Whe Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. When users update their passwords, the new credentials may be briefly held in the server database. While this doesn't grant the server any added capabilities—it already learns the users' passwords as part of the authentication process—it does disrupt the ex

CVE-2023-32682 [MEDIUM] CWE-287 CVE-2023-32682: Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. In affected ve Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. In affected versions it may be possible for a deactivated user to login when using uncommon configurations. This only applies if any of the following are true: 1. JSON Web Tokens are enabled for login via the `jwt_config.enabled` configuration setting. 2. The local

CVE-2023-32683 [MEDIUM] CWE-863 CVE-2023-32683: Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. A discovered o Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. A discovered oEmbed or image URL can bypass the `url_preview_url_blacklist` setting potentially allowing server side request forgery or bypassing network policies. Impact is limited to IP addresses allowed by the `url_preview_ip_range_blacklist` setting (by default

CVE-2022-39374 [MEDIUM] CWE-400 CVE-2022-39374: Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. If Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. If Synapse and a malicious homeserver are both joined to the same room, the malicious homeserver can trick Synapse into accepting previously rejected events into its view of the current state of that room. This can be exploited in a way that causes all fu

CVE-2022-39335 [MEDIUM] CWE-200 CVE-2022-39335: Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The 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 legitimate and permitted in their room. However, in version

CVE-2023-32323 [MEDIUM] CWE-20 CVE-2023-32323: Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A m Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and in

CVE-2022-41952 [MEDIUM] CWE-400 CVE-2022-41952: Synapse before 1.52.0 with URL preview functionality enabled will attempt to generate URL previews f Synapse before 1.52.0 with URL preview functionality enabled will attempt to generate URL previews for media stream URLs without properly limiting connection time. Connections will only be terminated after `max_spider_size` (default: 10M) bytes have been downloaded, which can in some cases lead to long-lived connections towards the streaming media s

CVE-2022-31152 [HIGH] CWE-703 CVE-2022-31152: Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#authorization-rules) which must be checked when determining if an event should be accepted into a room. In versions of Synapse up to and includi

CVE-2022-31052 [MEDIUM] CWE-674 CVE-2022-31052: Synapse is an open source home server implementation for the Matrix chat network. In versions prior Synapse is an open source home server implementation for the Matrix chat network. In versions prior to 1.61.1 URL previews of some web pages can exhaust the available stack space for the Synapse process due to unbounded recursion. This is sometimes recoverable and leads to an error for the request causing the problem, but in other cases the Synapse p

CVE-2021-41281 [HIGH] CWE-22 CVE-2021-41281: Synapse is a package for Matrix homeservers written in Python 3/Twisted. Prior to version 1.47.1, Sy Synapse is a package for Matrix homeservers written in Python 3/Twisted. Prior to version 1.47.1, Synapse instances with the media repository enabled can be tricked into downloading a file from a remote server into an arbitrary directory. No authentication is required for the affected endpoint. The last 2 directories and file name of the path are chose