CVE-2026-34189 in Pandora FMS
Summary
by MITRE • 10/01/2026
Cross-Site Request Forgery (CSRF) vulnerability allows unauthorized deletion of event responses via a forged GET request when an authenticated administrator visits a malicious page. This issue affects Pandora FMS: from 777 onwards.
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Analysis
by VulDB Data Team • 10/01/2026
The identified Cross-Site Request Forgery vulnerability in Pandora FMS versions starting from build 777 represents a critical authentication bypass mechanism that exploits the lack of state-changing request validation within the application's event management subsystem. This flaw specifically targets administrative functions, allowing an attacker to force an authenticated administrator to perform unintended actions without their knowledge or consent. The core technical deficiency lies in the implementation of the endpoint responsible for deleting event responses, which relies exclusively on GET requests rather than POST requests with anti-CSRF tokens or other state-change protections. In web application security architecture, it is a fundamental best practice that any action modifying server-side data must require explicit user intent verification through mechanisms such as synchronized CSRF tokens, custom request headers, or strict method restrictions to prevent coercion by third-party sites.
From an operational perspective, this vulnerability enables remote attackers with minimal interaction requirements to compromise the integrity of the monitoring infrastructure managed by Pandora FMS. By crafting a malicious webpage containing a hidden image tag or script that triggers a GET request to the vulnerable delete endpoint, an attacker can induce any logged-in administrator who visits the page to inadvertently remove critical event response records. This action disrupts the audit trail and historical data retention necessary for incident analysis, compliance reporting, and system troubleshooting. The impact is particularly severe because it targets administrators, whose sessions are typically long-lived and possess elevated privileges, thereby amplifying the potential damage to the overall security posture of the organization's monitoring environment.
This vulnerability aligns with CWE-352, which defines Cross-Site Request Forgery as a weakness where a user is tricked into submitting a malicious request that they did not intend to submit. Furthermore, it maps directly to MITRE ATT&CK technique T1076, known as Remote File Inclusion or in this context, the exploitation of web application logic flaws for unauthorized state changes. The specific use of GET requests for destructive operations violates OWASP guidelines which mandate that safe methods like GET should be idempotent and free from side effects on server data. The absence of a unique per-session token ensures that the browser automatically includes valid authentication cookies with every request, effectively allowing the attacker to impersonate the administrator's identity in the context of the vulnerable application without needing to steal session tokens or credentials directly.
Mitigation strategies must focus on implementing robust anti-CSRF controls immediately. Developers should replace GET requests used for deletion operations with POST, PUT, or DELETE methods that require explicit user confirmation and validation. Crucially, all state-changing endpoints must implement synchronized CSRF tokens generated per-session and validated server-side before processing the request. Additionally, setting the SameSite attribute on session cookies to Strict or Lax can provide a browser-level defense against cross-origin requests. For existing deployments of Pandora FMS prior to patched versions, administrators should restrict access to administrative interfaces through IP whitelisting, enforce short session timeouts, and monitor logs for unusual patterns of event response deletions originating from unexpected user agents or geographic locations until the software is updated to address this logic flaw.