Vulnerability details
CVE-2025-26399
Actively exploited
SolarWinds Web Help Desk
SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability
CVSS 3.1
9.8Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CVEProject cvelistV5 (CNA) (SolarWinds) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| SolarWinds | Web Help Desk | 12.8.7 and below | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399
- https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm
- https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-web-help-desk/ third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399 government-resource
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Details
- Published
- 2025-09-23
- Last updated
- 2026-08-04
- State
- Published
- Assigner (CNA)
- SolarWinds
- Kolun priority
- 90 · Critical
CISA KEV catalog
- Date added
- 2026-03-09
- Due date
- 2026-03-12
- Used in ransomware
- Yes
Exploit prediction (EPSS)
90.56%
Probability of exploitation in 30 days
99.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-502Deserialization of Untrusted Data