CVE-2025-26399CRITICAL 9.8CISA KEVEPSS p99.8%
CVE-2025-26399SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
SolarWinds / Web Help Desk
Description
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.
Scoring
| CVSS 3.1 | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 88.53% probability of exploitation · percentile 99.8% · 2026-06-15T12:03:41Z |
| Published | 2025-09-23 |
| Last modified | 2026-03-10 |
CISA KEV entry
Added to KEV: 2026-03-09
Underlying weaknesses· 1
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/
1
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Deserialization of Untrusted Datacwe-502 | 0% | live |
(incoming)1
| Type | Target | Confidence | Tier |
|---|---|---|---|
| KEVEntry | SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerabilitykev-cve-2025-26399 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.