SSRF in Ddfourtwo Sentry-Selfhosted-Mcp
CVE-2026-81421
A security flaw has been discovered in ddfourtwo sentry-selfhosted-mcp 0.4.0. The affected element is an unknown function of the component raw_sentry_api. The manipulation of the argument endpoint results in server-side request forgery. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (40.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Ddfourtwo Sentry-Selfhosted-Mcp — versions 0.4.0
Weakness classification (CWE)
References
- vuldb.com/vuln/395941 (technical-description, vdb-entry)
- vuldb.com/vuln/395941/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-81421 (third-party-advisory)
- vuldb.com/submit/887100 (third-party-advisory)
- github.com/ddfourtwo/sentry-selfhosted-mcp/issues/2 (issue-tracking, exploit)
- github.com/ddfourtwo/sentry-selfhosted-mcp/ (product)
Frequently asked questions
- What is CVE-2026-81421?
- CVE-2026-81421 is a high-severity vulnerability in Ddfourtwo Sentry-Selfhosted-Mcp, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.3/10. Published 2026-08-27.
- How severe is CVE-2026-81421?
- High severity. CVSS v3 base score is 7.3 out of 10.