CVE-2023-32683

Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. A discovered oEmbed or image URL can bypass the `url_preview_url_blacklist` setting potentially allowing server side request forgery or bypassing network policies. Impact is limited to IP addresses allowed by the `url_preview_ip_range_blacklist` setting (by default this only allows public IPs) and by the limited information returned to the client: 1. For discovered oEmbed URLs, any non-JSON response or a JSON response which includes non-oEmbed information is discarded. 2. For discovered image URLs, any non-image response is discarded. Systems which have URL preview disabled (via the `url_preview_enabled` setting) or have not configured a `url_preview_url_blacklist` are not affected. This issue has been addressed in version 1.85.0. Users are advised to upgrade. User unable to upgrade may also disable URL previews.

• CWE-863
• CWE-918

• https://github.com/matrix-org/synapse/pull/15601Patch
• https://github.com/matrix-org/synapse/security/advisories/GHSA-98px-6486-j7qcMitigation, Patch, Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X6DH5A5YEB5LRIPP32OUW25FCGZFCZU2/
• https://github.com/matrix-org/synapse/pull/15601Patch
• https://github.com/matrix-org/synapse/security/advisories/GHSA-98px-6486-j7qcMitigation, Patch, Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X6DH5A5YEB5LRIPP32OUW25FCGZFCZU2/

Published

Jun 6, 2023

Last Modified

Jun 17, 2026

Status

Modified

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