Intel/AIKIDO-2025-10688
matrix-synapse
AIKIDO-2025-10688
matrix-synapse is vulnerable to Open Redirect
Open Redirect Pre-CVE Published Oct 9, 2025
Found by Aikido Intel before public disclosure or CVE publication.
51
Medium Risk
This Affects:
matrix-synapse1.120.0 - 1.138.3
Fixed in 1.139.0Are you affected? Scan for Free
TL;DR
Affected versions of this package are vulnerable to open redirect attacks due to insufficient validation of the idp parameter in the legacy SSO flow. The vulnerability is mitigated by restricting the idp parameter to known values defined in the configuration file and by URL-encoding it to prevent malicious redirection.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range.
Background info
matrix-synapse is vulnerable to Open Redirect in versions 1.120.0 - 1.138.3.
How to fix this
Upgrade the matrix-synapse library to the patch version.
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