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    CVE-2024-53867

    Synapse is an open-source Matrix homeserver. The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected. This vulnerability is fixed in 1.120.1.

    Published:Dec 3, 2024
    Last Modified:Apr 15, 2026
    EPS:Dec 3, 2024
    EPSS Score:0.00098
    CVSS Score:4.3

    Affected Products

    Vendor
    Element-hq
    Product
    Synapse

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-170 Web Application Fingerprinting
    CAPEC-694 System Location Discovery

    Related CVEs

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    CVE-2025-30355 (CVSS 7.1) — Synapse is an open source Matrix homeserver implementation. A malicious server can craft events which, when re…
    CVE-2024-37303 (CVSS 5.3) — Synapse is an open-source Matrix homeserver. Synapse before version 1.106 allows, by design, unauthenticated r…
    CVE-2024-37302 (CVSS 7.5) — Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attac…
    CVE-2024-52805 (CVSS 8.2) — Synapse is an open-source Matrix homeserver. In Synapse before 1.120.1, multipart/form-data requests can in ce…
    CVE-2024-52815 (CVSS 8.7) — Synapse is an open-source Matrix homeserver. Synapse versions before 1.120.1 fail to properly validate invites…
    CVE-2024-53863 (CVSS 8.2) — Synapse is an open-source Matrix homeserver. In Synapse versions before 1.120.1, enabling the dynamic_thumbnai…
    CVE-2024-31208 (CVSS 6.5) — Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with S…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High