CVE-2023-38691
MediumCVSS 5.0Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
In versions 4.0.0 to 8.1.1, the matrix-appservice-bridge library allows a malicious Matrix server to use a foreign user's MXID in an OpenID exchange, enabling impersonation of users via the provisioning API.
Risk Assessment
This vulnerability could lead to unauthorized access to user resources and data, posing a significant security risk to the organization.
Recommendation
It is recommended to upgrade to versions 8.1.2 or 9.0.1, which contain patches. Alternatively, the provisioning API can be temporarily disabled.
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Original NVD description (English source)
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 does not check that the servername part of the `sub` parameter (containing the user's *claimed* MXID) is the the same as the servername we are talking to. A malicious actor could spin up a server on any given domain, respond with a `sub` parameter according to the user they want to act as and use the resulting token to perform provisioning requests. Versions 8.1.2 and 9.0.1 contain a patch. As a workaround, disable the provisioning API.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

