SSRF in Stoatchat
CVE-2026-73058
stoatchat versions before 0.15.0 fail to block the IPv6 unspecified address (::) in the SSRF blocklist, allowing unauthenticated attackers to bypass protections via the /proxy and /embed endpoints. Attackers can craft requests using IPv6 literal syntax to access services on the loopback interface and retrieve sensitive internal content.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (27.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 27.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001
Affected products
- Stoatchat — versions 0, 0.15.0
Weakness classification (CWE)
References
- github.com/stoatchat/stoatchat/security/advisories/GHSA-4rmr-77qv-hq47 (vendor-advisory)
- www.vulncheck.com/advisories/stoatchat-before-ssrf-via-ipv6-unspecified-address… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-73058?
- CVE-2026-73058 is a medium-severity vulnerability in Stoatchat, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.8/10. Published 2026-08-16.
- How severe is CVE-2026-73058?
- Medium severity. CVSS v3 base score is 5.8 out of 10.