CVE-2025-26399
Actively exploited. CVE-2025-26399 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-03-09) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2025-26399 is indexed in GitHub PoC and Nuclei. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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.
CSIRTS triage
- What
- The vulnerability allows an attacker to run commands on the host machine through deserialization of untrusted data.
- Who is affected
- Deployments of SolarWinds Web Help Desk are affected by this vulnerability.
- Urgency
- Remediation is critical due to active exploitation and the severity of the vulnerability.
- Action
- Patch SolarWinds Web Help Desk to the latest version to address this issue.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2025-26399 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
- NucleiA nuclei-templates detection/PoC template exists for this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2025-26399: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerabilitycisa-kev · 2026-03-09
External references
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[](https://www.csirts.com/cve/CVE-2025-26399)