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CVE-2025-26399

CriticalPublished

SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability

Published: Sep 23, 2025
Updated: Aug 4, 2026
Assigning CNA: SolarWinds
Evidence observed: Mar 9, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

89.5%

High · next 30 days

Percentile: 99.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

SolarWinds Web Help Desk was found to be susceptible to an unauthenticated AjaxProxy deserialization remote code execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine. This vulnerability is a patch bypass of CVE-2024-28988, which in turn is a patch bypass of CVE-2024-28986.

Sources

CVE-2025-26399Detection
Detection for CVE-2025-26399

Responsible use

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