CVE-2025-26397 SolarWinds Observability Self-Hosted Deserialization of Untrusted Data Local Privilege Escalation Vulnerability

High 7.8 Published 24 Jul 2025 Updated 24 Jul 2025

A low-privilege attacker with local access can exploit deserialization to escalate privileges and execute malicious files in protected folders.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-26397?

CVE-2025-26397 is a high-severity unsafe deserialization vulnerability in SolarWinds Observability Self-Hosted, published on 24 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-502

Which versions are affected by CVE-2025-26397?

It affects 1 product.

Products include Solarwinds Observability Self-Hosted.

How do I fix CVE-2025-26397?

No fix has been published for CVE-2025-26397 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2025-26397 being exploited?

There is no known exploitation of CVE-2025-26397 in the wild and no public exploit code.

Sources

Also known as GHSA-4jq7-688w-w4r4.