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Luu, T.J.

🔥 This vulnerability is being actively exploited in the wild (CISA Known Exploited Vulnerabilities catalog)

CVE-2025-26399: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

infovulnerability🔥 Actively Exploited

security

Source: CISA Known Exploited VulnerabilitiesMarch 8, 2026CVE-2025-26399

Summary

SolarWinds Web Help Desk has a deserialization of untrusted data vulnerability (a flaw where the software accepts and processes untrusted information in a way that lets attackers run malicious code) in a component called AjaxProxy that could allow attackers to execute commands on the affected computer. This vulnerability is currently being actively exploited by real attackers.

Solution / Mitigation

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Refer to the SolarWinds security advisory and Web Help Desk 12.8.7 Hotfix 1 release notes for specific details.

Vulnerability Details

EPSS (30-day exploit probability)

EPSS: 34.2%

Exploit Maturity

🔥 Actively Exploited

Classification

Attack SophisticationModerate

Taxonomy References

CWE (Weakness Type)

CWE-502

CAPEC (Attack Pattern)

CAPEC-586

Original source: https://nvd.nist.gov/vuln/detail/CVE-2025-26399

First tracked: March 9, 2026 at 04:00 PM

Classified by LLM (prompt v3) · confidence: 95%