CVE WatchOct 11, 2026

CVE-2025-26399

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

CVSS

9.8

Critical

EPSS

89.5%

p100

KEV

YES

Mar 9, 2026

Exploit Today

0-100

Published: Sep 23, 2025 · Last modified: Oct 11, 2026 · CWE-502

EPSS · 30d

89.5%EPSS · 30 days89.5%

2026-09-172026-10-15

KEV catalog record

Product

SolarWinds / Web Help Desk

Vulnerability

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

Added to KEV

Mar 9, 2026

Remediate by

Mar 12, 2026

Known ransomware use

Yes

Summary 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.

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.

Notes

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

Technical 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.

Official references

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