CVE-2026-63306

High

Description

stoatchat before 0.13.5 contains an unauthenticated server-side request forgery vulnerability in the /proxy and /embed endpoints that accept arbitrary URLs without DNS resolution filtering or private IP range validation. Attackers can enumerate internal services, fingerprint applications, and reach instance metadata endpoints by supplying malicious URLs or leveraging redirect chains to access internal infrastructure.

SeverityHigh

CVSS8.6

Exploit probability—

ProductStoatchat

PublishedJul 16, 2026

First seenJul 16, 2026

Weakness typeCWE-918Server-side request forgery (SSRF)

How to fix

Update

stoatchat stoatchat0.13.5 or later

Vendor advisories

github.com/stoatchat/stoatchat/security/advisories/GHSA-xhww-5g9p-vvq5

Affected products

Product	Affected versions	Fixed in
stoatchat stoatchat	v < 0.13.5	0.13.5

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