Web Help Desk - RCE (CVE-2025-26399)
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.
psychologyCrowdSec Analysis
CVE-2025-26399 is a critical unauthenticated deserialization vulnerability in SolarWinds Web Help Desk that enables remote code execution through the AjaxProxy component. Attackers can exploit this patch bypass remotely without authentication to execute commands on the host, potentially compromising confidential data, altering systems, and disrupting service availability.
CrowdSec has been tracking this vulnerability and its exploits since 25th of August 2026.
CrowdSec network data shows that most actors exploiting CVE-2025-26399 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature. CrowdSec data also reveals a clear uptick in attacks involving CVE-2025-26399 over the past week. Activity is above the usual baseline, suggesting growing attention from attackers. This may reflect rising awareness, recent exploit releases, or expanded targeting efforts.
Attackers target the SolarWinds Web Help Desk endpoint /helpdesk/WebObjects/Helpdesk.woa; exposure is indicated by identifying Web Help Desk branding and versions earlier than 12.8.7, which are vulnerable to unauthenticated AjaxProxy deserialization leading to remote code execution.
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| Event | Date |
|---|---|
| CVE Published | 2025-09-23 |
| CISA KEV | 2026-03-09 |
| CISA Remediation Deadline | 2026-03-12 |
| Rule Released | 2026-08-25 |
| CrowdSec First Seen | 2026-09-03 |
Remediation & Protection
External References
- https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-web-help-desk/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399
- 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://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-26399.yaml