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Vendor Workaround
To mitigate this vulnerability, change the URL patterns in the ACME responder's web.xml from exact-match to prefix-match. Edit the file /usr/share/pki/acme/webapps/acme/WEB-INF/web.xml and replace the url-pattern entries for the enable and disable endpoints: <url-pattern>/enable</url-pattern> -> <url-pattern>/enable/*</url-pattern> <url-pattern>/disable</url-pattern> -> <url-pattern>/disable/*</url-pattern> Then restart the PKI server for the changes to take effect.
Tracking
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Tue, 28 Jul 2026 16:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in Dogtag PKI's ACME responder where the web.xml security constraints use exact URL pattern matching for admin-only enable/disable endpoints. By appending a trailing slash to the URL, an unauthenticated attacker can bypass the Tomcat authentication constraint while RESTEasy still routes the request to the handler, allowing unauthorized toggling of the ACME service state including persistent denial of service. | |
| Title | Dogtag-pki: pki-core: redhat-pki: pki: acme admin enable/disable endpoint authentication bypass via trailing slash | |
| First Time appeared |
Redhat
Redhat certificate System Redhat enterprise Linux |
|
| Weaknesses | CWE-288 | |
| CPEs | cpe:/a:redhat:certificate_system:10 cpe:/a:redhat:certificate_system:11 cpe:/a:redhat:certificate_system:9 cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:6 cpe:/o:redhat:enterprise_linux:7 cpe:/o:redhat:enterprise_linux:8 cpe:/o:redhat:enterprise_linux:9 |
|
| Vendors & Products |
Redhat
Redhat certificate System Redhat enterprise Linux |
|
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-07-28T13:26:27.569Z
Reserved: 2026-07-28T10:15:23.892Z
Link: CVE-2026-18047
Updated: 2026-07-28T13:26:23.814Z
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