CVE-2025-26399 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 89.5% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2026-03-12.
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 89.5% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-502 |
| On CISA KEV | yes — remediate by 2026-03-12 |
| Public exploit | none known |
| Published | 2025-09-23 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability |
|---|---|
| Added | 2026-03-09 |
| Due | 2026-03-12 |
| Vendor / product | SolarWinds / Web Help Desk |
| Ransomware use | known |
Affected (1)
| Vendor | Product |
|---|---|
| solarwinds | web help desk |
References
- https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm
- https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399
- https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-web-help-desk/
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