SSRF in Stoatchat
CVE-2026-63306
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.003 · change: -0.001
Affected products
- Stoatchat — versions 0, 0.13.5
Weakness classification (CWE)
References
- github.com/stoatchat/stoatchat/security/advisories/GHSA-xhww-5g9p-vvq5 (vendor-advisory)
- www.vulncheck.com/advisories/stoatchat-before-unauthenticated-ssrf-via-proxy-an… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-63306?
- CVE-2026-63306 is a high-severity vulnerability in Stoatchat, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-07-16.
- How severe is CVE-2026-63306?
- High severity. CVSS v3 base score is 8.6 out of 10.