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Vulnerabilities CVE-2026-63096

CVE-2026-63096

Medium
Open
TLP:CLEAR

Dendrite 0.13.8 SSRF via Unauthenticated Legacy Media Download Endpoint

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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.

Details

CVSS Score
6.9
EPSS Score
0.21%

11.7th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
Confidence
90%
Published
Jul 17, 2026
Last Modified
Jul 28, 2026
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