CVE-2025-26399
SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability
KEV RANSOMWARECRITICAL 9.8EPSS 90.1%
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
- SolarWinds · Web Help Desk
- CVSS v3.1 NVD
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 90.12% chance of exploitation in the next 30 days, 100th percentile
- CISA KEV
- added 2026-03-09, used in ransomware campaigns
- Nuclei
- critical · CWE-502
- Published
- 2025-09-23
- Updated
- 2026-08-04
Proof-of-concept exploits (2)
- https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-w…
- rxerium/CVE-2025-263992★ · 2025-10-14
Nuclei templates (1)
Security advisories
- https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399
- https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-w…
- https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8…