Risk Letters

Exploited vulnerability

CVE-2025-26399

TLP:CLEAR

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

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.

Facts

  • Vendor: SolarWinds
  • Product: Web Help Desk
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 90.6 %
  • On CISA's Known Exploited Vulnerabilities list since: 9 March 2026
  • First known exploitation: 9 March 2026
  • Used in ransomware campaigns (per CISA): Yes
  • CISA's deadline for US federal agencies: 12 March 2026
  • Weakness: CWE-502
  • First seen by Risk Letters: 20 March 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD