Vulnerability · Published Jul 16, 2026 · Assigned by VulnCheck

CVE-2026-63306stoatchat before 0.13.5 Unauthenticated SSRF via proxy and embed endpoints

High 8.6

In plain English

A high-severity server-side request forgery in stoatchat from stoatchat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)0.3%top 76.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
stoatchat	stoatchat	0 – before 0.13.5

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

References

GitHub Security Advisory (GHSA-xhww-5g9p-vvq5) vendor-advisory
VulnCheck Advisory: stoatchat before 0.13.5 Unauthenticated SSRF via proxy and embed endpoints third-party-advisory