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matrix synapse vulnerabilities and exploits
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7.5
CVSSv3
CVE-2019-11842
An issue exists in Matrix Sydent prior to 1.0.3 and Synapse prior to 0.99.3.1. Random number generation is mishandled, which makes it easier for malicious users to predict a Sydent authentication token or a Synapse random ID.
Matrix Synapse
Matrix Sydent
7.5
CVSSv3
CVE-2018-10657
Matrix Synapse prior to 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.
Matrix Synapse
7.5
CVSSv3
CVE-2022-31152
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...
Matrix Synapse
5.3
CVSSv3
CVE-2022-41952
Synapse prior to 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 i...
Matrix Synapse
6.1
CVSSv3
CVE-2020-26891
AuthRestServlet in Matrix Synapse prior to 1.21.0 is vulnerable to XSS due to unsafe interpolation of the session GET parameter. This allows a remote malicious user to execute an XSS attack on the domain Synapse is hosted on, by supplying the victim user with a malicious URL to t...
Matrix Synapse
7.5
CVSSv3
CVE-2018-12291
The on_get_missing_events function in handlers/federation.py in Matrix Synapse prior to 0.31.1 has a security bug in the get_missing_events federation API where event visibility rules were not applied correctly.
Matrix Synapse
6.5
CVSSv3
CVE-2022-39374
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 curre...
Matrix Synapse
4.3
CVSSv3
CVE-2023-32323
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 f...
Matrix Synapse
5.4
CVSSv3
CVE-2023-32682
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...
Matrix Synapse
5.4
CVSSv3
CVE-2023-32683
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 addres...
Matrix Synapse
CVSSv3
CVSSv2
CVSSv3
VMScore
Recommendations:
CVE-2024-27322
CVE-2006-4304
wireless
CVE-2023-23022
local file inclusion
CVE-2024-27058
CVE-2024-33820
open redirect
CVE-2024-27079
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