CVE-2026-41920 in Traffic Server
Summary
by MITRE • 07/29/2026
Improper Access Control vulnerability in Apache Traffic Server.
This issue affects Apache Traffic Server: from 9.0.0 through 9.1.14, from 10.0.0 through 10.1.3.
Users are recommended to upgrade to version 9.1.15 or 10.1.4, which fixes the issue.
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Analysis
by VulDB Data Team • 07/29/2026
The improper access control vulnerability in Apache Traffic Server represents a critical security flaw that undermines the software's ability to properly authenticate and authorize users accessing its administrative interfaces and configuration resources. This vulnerability affects versions ranging from 9.0.0 through 9.1.14 and 10.0.0 through 10.1.3, creating a window of opportunity for malicious actors to exploit weak access controls within the traffic server's management systems.
The technical implementation flaw stems from insufficient validation mechanisms within the server's authentication framework, allowing unauthorized users to bypass normal access restrictions. This weakness manifests when legitimate administrative functions are exposed without proper authorization checks, enabling attackers to perform privileged operations such as modifying server configurations, accessing sensitive data, or disabling security features. The vulnerability primarily impacts the traffic server's management console and API endpoints that should only be accessible to authorized administrators.
The operational impact of this vulnerability extends beyond simple unauthorized access, potentially allowing attackers to compromise entire server infrastructures and disrupt service availability. Attackers could leverage this weakness to modify caching policies, redirect traffic through malicious endpoints, or extract confidential information from the server's configuration files. The consequences become particularly severe in environments where Apache Traffic Server serves as a core component of content delivery networks or enterprise proxy services, as unauthorized modifications could affect thousands of users simultaneously.
Organizations running affected versions should immediately implement the recommended upgrades to versions 9.1.15 or 10.1.4, which contain patches addressing the access control deficiencies. The fix typically involves implementing stronger authentication checks and ensuring that all administrative interfaces properly validate user credentials before granting privileged operations. Security teams should also conduct thorough audits of their traffic server configurations to identify any potential exploitation attempts and implement additional monitoring for suspicious access patterns.
This vulnerability aligns with CWE-285, which addresses improper authorization issues in software systems, and maps to ATT&CK technique T1078 for valid accounts and privilege escalation. The flaw demonstrates how insufficient access control mechanisms can create persistent security risks even when other defensive measures are properly implemented. Organizations should consider implementing network segmentation and additional monitoring controls around their traffic server environments until full patch deployment is complete, as the vulnerability could enable attackers to establish persistent access to critical infrastructure components.