CVE-2026-48211 in OTRS
Summary
by MITRE • 10/12/2026
An authenticated administrator can be induced to delete administrative Import/Export templates through a Cross-Site Request Forgery (CSRF) attack. The OTRS AdminImportExport::TemplateDelete action does not validate the request's ChallengeToken, allowing an unauthenticated remote attacker to craft a malicious request that is executed with the privileges of an active administrator session.
This issue affects OTRS:
* 7.0.X * 8.0.X * 2023.X * 2024.X * 2025.X * 2026.X before 2026.7.X
Please note that ((OTRS)) Community Edition 6.x and before are vulnerable. Products based on the ((OTRS)) Community Edition also very likely to be affected
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Analysis
by VulDB Data Team • 10/12/2026
The vulnerability described constitutes a critical Cross-Site Request Forgery (CSRF) flaw within the administrative interface of OTRS, specifically targeting the AdminImportExport::TemplateDelete action. This security deficiency allows an authenticated administrator to be tricked into performing unintended actions that result in the deletion of administrative Import/Export templates. The core technical issue lies in the application's failure to validate a ChallengeToken or similar anti-CSRF token during state-changing requests. In secure web applications, any action that modifies server-side data must require proof that the request originated from the legitimate user interface and not from an external source. By omitting this validation step for template deletion operations, OTRS inadvertently trusts all incoming delete requests regardless of their origin, provided they are sent with valid administrator session cookies or authentication headers.
From a technical perspective, this flaw aligns directly with CWE-352, which defines Cross-Site Request Forgery as an attack that forces an end user to execute unwanted actions on a trusted web application in which they are currently authenticated. The attacker typically crafts a malicious webpage containing a hidden form or script that automatically submits the delete request when visited by the victim administrator. Because modern browsers include session cookies with every request to the target domain, the forged request appears legitimate to the OTRS server. This mechanism bypasses standard authentication checks since the user is already logged in, exploiting the trust relationship between the browser and the web application. The vulnerability affects multiple versions of OTRS including 7.0.X through 2026.X prior to version 2026.7.X, as well as older Community Edition releases like 6.x and earlier, indicating a systemic lack of CSRF protection in legacy code paths or specific administrative modules across the product line.
The operational impact of this vulnerability is significant due to its potential for data integrity compromise and service disruption. Administrative Import/Export templates are essential configuration artifacts used by system administrators to manage ticket workflows, customer data mapping, and automated processes within the OTRS environment. Their unauthorized deletion can lead to immediate operational paralysis if critical integration points fail or if routine administrative tasks become impossible without reconfiguration. Furthermore, this vulnerability serves as a potential precursor for more severe attacks. An attacker with CSRF capabilities might leverage similar flaws in other modules to escalate privileges, exfiltrate sensitive data by triggering export actions that send information to external servers, or deface the application interface. The lack of token validation represents a fundamental weakness in the security architecture of these OTRS versions, exposing organizations using these systems to remote exploitation without any need for complex social engineering beyond luring an admin to visit a malicious site.
To mitigate this risk, immediate remediation is required by upgrading to patched versions where the ChallengeToken validation has been implemented correctly for all state-changing administrative actions. For environments unable to upgrade immediately due to compatibility constraints or operational dependencies, compensating controls should be deployed at the network perimeter level. Web Application Firewalls (WAFs) can be configured with rulesets that detect and block CSRF patterns, such as verifying the Origin header or implementing strict SameSite cookie attributes if supported by the infrastructure. Additionally, enforcing multi-factor authentication for administrative accounts adds a layer of defense-in-depth, making it harder for attackers to maintain persistent access even after exploiting initial entry points. Regular security audits focusing on state-changing endpoints and ensuring consistent implementation of anti-CSRF tokens across all modules are essential steps toward hardening OTRS deployments against this class of vulnerability.