# CVE-2026-86539

## Summary

- **CVE ID:** CVE-2026-86539
- **Severity:** MEDIUM
- **CVSS Score:** 7.2 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N)
- **CWE:** CWE-918
- **Published:** Sep 7, 2026
- **Last Modified:** Sep 11, 2026

## Description

knowns through 0.33.0 contains a server-side request forgery vulnerability in the POST /api/embedding-models/test endpoint that issues outbound requests to caller-supplied destinations without validation. Attackers can enumerate internal hosts and cloud metadata endpoints by observing transport error messages that reveal network reachability information.

## Affected Products

- knowns-dev — knowns (0)

## References

- [CNA](https://github.com/knowns-dev/knowns/security/advisories/GHSA-qx9v-m9gg-p5jg)
- [CNA](https://github.com/knowns-dev/knowns/blob/v0.33.0/internal/server/routes/embedding_models.go#L64-L110)
- [CNA](https://github.com/knowns-dev/knowns/blob/v0.33.0/internal/server/routes/imports.go#L317-L330)
- [CNA](https://www.vulncheck.com/advisories/knowns-through-0.33.0-server-side-request-forgery-via-embedding-models-endpoint)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 10.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._