CVE-2025-26399

CRITICALCVSS 9.8Known Exploited

CISA Known Exploited Vulnerability

https://www.solarwinds.com/trust-center/security-advisories/cve-2025-26399 ; https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm ; https://nvd.nist.gov/vuln/detail/CVE-2025-26399

Remediation deadline: March 12, 2026

Ransomware use: Known

Description

SolarWinds Web Help Desk contain a deserialization of untrusted data vulnerability in AjaxProxy that could allow an attacker to run commands on the host machine.

Timeline

Published:September 23rd, 2025 5:15 AM

Last modified:October 11th, 2026 8:10 PM

Added to KEV:March 9th, 2026

CVSS Scoring

CVSS v3: 9.8 (CRITICAL)

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

Affected Software

From NVD CPE configuration data

Vendors

solarwinds

Products

web_help_desk

Weaknesses (CWE)

CWE-502

References & Reports

Advisories, patches, and third-party reports

Source: NIST NVD · Data may lag official sources by up to one minute