CVEvulnerability

CVE-2025-26399

9.8 CRITICAL Known exploited Published 2025-09-23 Modified 2026-10-11 Official page ↗

CISA Known Exploited Vulnerability

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability — SolarWinds Web Help Desk

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.

Added to KEV: 2026-03-09
Remediation due: 2026-03-12
Ransomware use: Known
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

Status: Analyzed
Published: 2025-09-23
Last modified: 2026-10-11
Assigner: [email protected]
CVSS 3.1 ([email protected]): 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1 ([email protected]): 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses: CWE-502

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.

Affected configurations

• solarwinds web help desk (<= 12.8.6) • solarwinds web help desk 12.8.7

Weakness · CWE (1)

CWE-502 Deserialization of Untrusted Data weakness

References