CVE-2023-38691 matrix-appservice-bridge doesn't verify the sub parameter of an openId token exhange, allowing unauthorized access to provisioning APIs

matrix-appservice-bridge provides an API for setting up bridges. Starting in version 4.0.0 and prior to versions 8.1.2 and 9.0.1, a malicious Matrix server can use a foreign user's MXID in an OpenID exchange, allowing a bad actor to impersonate users when using the provisioning API. The library...

CVE-2023-38691

CVE-2023-38691 affects matrix-appservice-bridge. The issue: the bridge does not verify that the servername in the OpenID sub claim matches the target server, allowing a malicious Matrix server to impersonate users via the provisioning API. Affected versions are 4.0.0 up to 8.1.1 and 9.0.0; patch ...

PT-2023-26556 · Unknown · Matrix-Appservice-Bridge

Name of the Vulnerable Software and Affected Versions: matrix-appservice-bridge versions 4.0.0 through 8.1.1 matrix-appservice-bridge versions 9.0.0 Description: A malicious Matrix server can use a foreign user's MXID in an OpenID exchange, allowing a bad actor to impersonate users when using the...

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