CVE-2025-26397 in Observability Self-Hosted
Summary
by MITRE • 07/24/2025
SolarWinds Observability Self-Hosted is susceptible to Deserialization of Untrusted Data Local Privilege Escalation vulnerability. An attacker with low privileges can escalate privileges to run malicious files copied to a permission-protected folder. This vulnerability requires authentication from a low-level account and local access to the host server.
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Analysis
by VulDB Data Team • 11/13/2025
The vulnerability identified as CVE-2025-26397 affects SolarWinds Observability Self-Hosted platforms and represents a critical deserialization flaw that enables local privilege escalation. This vulnerability falls under the CWE-502 category, specifically addressing the dangerous practice of deserializing untrusted data without proper validation mechanisms. The flaw exists within the application's handling of serialized data structures, which are commonly used for data exchange and storage operations. When untrusted data is deserialized, it can execute arbitrary code or manipulate the application's internal state in ways that were not intended by the developers. This particular vulnerability requires an attacker to first obtain a low-privilege account and then gain local access to the target host server, making it a local privilege escalation issue rather than a remote one.
The technical exploitation of this vulnerability occurs when a malicious actor with minimal user permissions can leverage the deserialization flaw to execute code with elevated privileges. The attack vector specifically requires local system access, meaning the attacker must already have some level of presence on the target system. The vulnerability allows the attacker to copy malicious files to permission-protected folders and subsequently execute them with higher privileges than initially available. This mechanism typically involves crafting specially formatted serialized data that, when processed by the vulnerable application, triggers unintended behavior resulting in privilege elevation. The flaw essentially bypasses normal access controls by exploiting how the application processes serialized objects, potentially allowing attackers to execute arbitrary commands or install persistent backdoors.
The operational impact of CVE-2025-26397 is significant for organizations running SolarWinds Observability Self-Hosted solutions, as it provides a pathway for attackers to gain unauthorized elevated access to critical monitoring infrastructure. This vulnerability directly affects the security posture of systems that rely on SolarWinds for infrastructure monitoring and observability, potentially compromising the integrity of monitoring data and the underlying system. Organizations may face scenarios where attackers can escalate from regular user accounts to administrative privileges, enabling them to modify system configurations, access sensitive monitoring data, or establish persistent access points within their networks. The local access requirement means that attackers must already have some foothold on the system, but once achieved, the privilege escalation can be devastating for system security.
Mitigation strategies for CVE-2025-26397 should focus on both immediate protective measures and long-term architectural improvements. Organizations should implement strict access controls and limit local system access to only necessary personnel with proper authorization. Network segmentation and monitoring of local system activities can help detect unusual behavior that might indicate exploitation attempts. The recommended approach includes applying vendor-provided patches and updates as soon as they become available, while also implementing runtime protections that monitor for suspicious deserialization activities. Security teams should consider implementing principle of least privilege models, ensuring that user accounts have only the minimum necessary permissions to perform their functions. Additionally, regular security audits and penetration testing of monitoring infrastructure can help identify potential exploitation vectors before they can be leveraged by malicious actors, aligning with ATT&CK framework techniques that focus on privilege escalation and persistence mechanisms.