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

> CVE-2025-26399: SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2025-26399
Last updated: 2026-10-11T20:10:00Z

- Published: 2025-09-23 05:07 UTC · Updated: 2026-10-11 20:10 UTC · Assigner: SolarWinds
- CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS: 90.1%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-03-09, federal due date 2026-03-12, ransomware use: Known
- CWE: CWE-502

## 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.

## CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- SolarWinds: Web Help Desk

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-26399)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-26399)
- [https://documentation.solarwinds.com/en/success\_center/whd/content/release\_notes/whd\_12-8-7-hotfix-1\_release\_notes.htm](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.solarwinds.com/trust-center/security-advisories/CVE-2025-26399)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-26399 · Markdown: https://rewindex.com/cve/CVE-2025-26399.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-26399 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:06:17.427Z