CVE-2026-18047: Authentication Bypass Using an Alternate Path or Channel in Red Hat Red Hat Certificate System 10
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.
AI Analysis
Technical Summary
The vulnerability in Red Hat Certificate System 10 involves the ACME responder component of Dogtag PKI, where the web.xml security constraints rely on exact URL pattern matching for admin-only enable/disable endpoints. By appending a trailing slash to these URLs, an attacker can bypass the Tomcat authentication constraints because RESTEasy still routes the request to the handler despite the altered URL. This allows an unauthenticated attacker to toggle the ACME service state, which can lead to unauthorized changes including persistent denial of service conditions.
Potential Impact
The vulnerability allows an unauthenticated attacker to bypass authentication controls and toggle the ACME service state. This can result in unauthorized changes to the service, including persistent denial of service. The confidentiality impact is none, but integrity and availability are affected.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is stated in the advisory. Users should monitor the Red Hat advisory page for updates and apply any patches or mitigations once available.
CVE-2026-18047: Authentication Bypass Using an Alternate Path or Channel in Red Hat Red Hat Certificate System 10
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.
CVSS v3.1
Score 6.5medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Red Hat Certificate System 10 involves the ACME responder component of Dogtag PKI, where the web.xml security constraints rely on exact URL pattern matching for admin-only enable/disable endpoints. By appending a trailing slash to these URLs, an attacker can bypass the Tomcat authentication constraints because RESTEasy still routes the request to the handler despite the altered URL. This allows an unauthenticated attacker to toggle the ACME service state, which can lead to unauthorized changes including persistent denial of service conditions.
Potential Impact
The vulnerability allows an unauthenticated attacker to bypass authentication controls and toggle the ACME service state. This can result in unauthorized changes to the service, including persistent denial of service. The confidentiality impact is none, but integrity and availability are affected.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is stated in the advisory. Users should monitor the Red Hat advisory page for updates and apply any patches or mitigations once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-07-28T10:15:23.892Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-18047","vendor":"Red Hat"}]
Threat ID: 6a68a9b09c2644c7f8a7808c
Added to database: 07/28/2026, 13:08:00 UTC
Last enriched: 07/30/2026, 00:00:03 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 73
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