CVE-2025-26399
critical CISA KEVSolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
Vendor / product: SolarWinds — Web Help Desk
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.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2025-09-23 05:15
Modified: 2026-10-11 20:10
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Listed in CISA KEV
Added 2026-03-09 · due 2026-03-12
Known ransomware use: Known
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
solarwinds / web_help_desk ≤12.8.6, 12.8.7
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399
References
- https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-... psirt@solarwinds.com
- https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399 psirt@solarwinds.com
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399 134c704f-9b21-4f2e-91b3-4a467353bcc0
- https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-we... 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
CISA KEV — fetched 2026-10-27 06:50 UTC · record ↗
NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗