CVE-2026-63096
Medium
Description
Dendrite through 0.13.8 contains a server-side request forgery vulnerability that allows unauthenticated attackers to cause the server to open outbound TLS connections to arbitrary hosts and ports by supplying an unvalidated serverName parameter to the legacy media download endpoint. Attackers can exploit distinguishable error response classes and leaked internal IP addresses in error messages to perform blind port scanning and enumerate internal network topology.
SeverityMedium
CVSS5.8
Exploit probability—
ProductMatrix-org Dendrite
PublishedJul 17, 2026
First seenJul 17, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| matrix-org dendrite | v ≤ 0.13.8 | — |
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