# CVE-2026-18369

## Summary

- **CVE ID:** CVE-2026-18369
- **Severity:** MEDIUM
- **CVSS Score:** 5.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N)
- **CWE:** CWE-918
- **Published:** Jul 30, 2026
- **Last Modified:** Sep 14, 2026

## Description

A flaw was found in Dogtag PKI's ACME responder where the HTTP-01 challenge validator accepts IP address literals as dns identifiers and follows HTTP redirects without validating that the target is a public address. An unauthenticated ACME account holder can exploit this to perform server-side request forgery (SSRF), making the Dogtag server send HTTP GET requests to internal network services. With the InMemory database backend, the response body of internal targets is disclosed to the attacker through the ACME challenge error.

## Affected Products

- Red Hat — Red Hat Certificate System 10.4 EUS for RHEL-8 (8060020260814202723.07fb4edf)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-18369)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2509234)
- [CNA](https://access.redhat.com/errata/RHSA-2026:67110)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.22%
- **EPSS Percentile:** 13.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._