🛡️ CVE-2023-32323
🟡 CVSS 5.0 — Medium ✅ No Known Exploit CWE-20 NVD
5.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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 including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently.

Details

Severity Medium
CVSS Score 5.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
CWE CWE-20
Public Exploit ✅ No
Source NVD
Published 2023-05-24
Updated 2026-06-15
Modified 2025-02-13

Affected Packages

Software From version Fixed in
matrix-synapse 1.74.0
synapse 1.74.0

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