5.8Medium
CVE-2026-63096Dendrite 0.13.8 SSRF via Unauthenticated Legacy Media Download Endpoint
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.
Weakness (CWE):
CWE-918
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| matrix | dendrite | ≤ 0.13.8 | |
| matrix-org | dendrite | ≤ 0.13.8 |
References and patches
- Researcher Disclosure technical-descriptionexploit
- https://www.vulncheck.com/advisories/dendrite-ssrf-via-unauthenticated-legacy-media-download-endpoint third-party-advisory