GHSA-26c5-ppr8-f33p

    Dashboard / Vulnerabilities / GHSA-26c5-ppr8-f33p

    GHSA-26c5-ppr8-f33p

    Published: 6 Jun 2023Last Modified: 10 Sept 2026

    Summary: Synapse has improper checks for deactivated users during login

    Details: ### Impact It may be possible for a deactivated user to login when using uncommon configurations. This only applies if any of the following are true: * [JSON Web Tokens are enabled for login](https://matrix-org.github.io/synapse/latest/jwt.html) via the `jwt_config.enabled` configuration setting * The [local password database is enabled](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#password_config) via the `password_config.enabled` and `password_config.localdb_enabled` configuration settings *and* a user's password is [updated via an admin API](https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html#create-or-modify-account) after a user is deactivated. **Note that the local password database is enabled by default**, but it is uncommon to set a user's password after they've been deactivated. Installations that are configured to only allow login via Single Sign-On (SSO) via CAS, SAML or OpenID Connect (OIDC); or via an external password provider (e.g. LDAP) are not affected. ### Patches * If using JSON Web Token logins: #15624 * For other users: #15634 ### Workarounds If not using JSON Web Tokens, ensure that deactivated users do not have a password set. This list of users can be queried from PostgreSQL: ```sql SELECT name FROM users WHERE password_hash IS NOT NULL AND deactivated = 1; ```

    References: https://github.com/matrix-org/synapse/security/advisories/GHSA-26c5-ppr8-f33p, https://nvd.nist.gov/vuln/detail/CVE-2023-32682, https://github.com/matrix-org/synapse/issues/12274, https://github.com/matrix-org/synapse/pull/15624, https://github.com/matrix-org/synapse/pull/15634, https://github.com/matrix-org/synapse, https://github.com/matrix-org/synapse/releases/tag/v1.85.0, https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-84.yaml, https://lists.fedoraproject.org/archives/list/[email protected]/message/X6DH5A5YEB5LRIPP32OUW25FCGZFCZU2, https://matrix-org.github.io/synapse/latest/admin_api/user_admin_api.html#create-or-modify-account, https://matrix-org.github.io/synapse/latest/jwt.html, https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#password_config

    Affected packages

    Package

    Name: matrix-synapse

    Purl: pkg:pypi/matrix-synapse

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.85.0

    Affected versions

    0.33.5
    0.33.5.1
    0.33.6
    0.33.6rc1
    0.33.7
    0.33.7rc1
    0.33.7rc2
    0.33.8
    0.33.8rc2
    0.33.9

    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
    GHSA-26c5-ppr8-f33p | CVE-DB