CVE-2025-26399

CRITICAL9.8

CISA KEV

Published 2025-09-23 · Updated 2026-10-11 · Source psirt@solarwinds.com

Summary

CVE-2025-26399 is a critical-severity (CVSS 9.8) vulnerability in SolarWinds Web Help Desk. CISA added it to the Known Exploited Vulnerabilities catalog on March 9, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 12, 2026. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. SolarWinds has 11 vulnerabilities in the KEV catalog, 2 of them linked to ransomware.

All 11 known-exploited SolarWinds vulnerabilities →

Description

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.

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

CWE-502CWE-502

CISA Known-Exploited Vulnerability

Product: SolarWinds — Web Help Desk

Name: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

Date added: 2026-03-09 · Due: 2026-03-12

USED IN RANSOMWARE

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

View on NVD

More exploited SolarWinds vulnerabilities

Most recently added to CISA KEV

CVE-2026-28318
Serv-U — SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
added 2026-06-05
CVE-2025-40536
Web Help Desk — SolarWinds Web Help Desk Security Control Bypass Vulnerability
added 2026-02-12
CVE-2025-40551
Web Help Desk — SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
added 2026-02-03
CVE-2024-28987
Web Help Desk — SolarWinds Web Help Desk Hardcoded Credential Vulnerability
added 2024-10-15
CVE-2024-28986
Web Help Desk — SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
added 2024-08-15
CVE-2024-28995
Serv-U — SolarWinds Serv-U Path Traversal Vulnerability
added 2024-07-17

View all →

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