# CVE-2025-26399: Web Help Desk - RCE

> Live exploitation tracking for CVE-2025-26399 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2025-26399

## Key facts

- **Exploitation phase:** Background Noise. Continuous low-level scanning or exploitation attempts are observed, mostly opportunistic and automated.
- **CVSS score:** 9.8
- **Public exploit available:** Yes
- **Affected products:** SolarWinds Web Help Desk
- **Weaknesses:** CWE-502 (Deserialization of Untrusted Data)
- **Tags:** enterprise_software, web_application

## 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.

## CrowdSec analysis

[CVE-2025-26399](https://euvd.enisa.europa.eu/vulnerability/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.
Telemetry from the CrowdSec network also shows that exploitation activity for CVE-2025-26399 remains steady week-over-week. Attack volumes are consistent with long-term trends, indicating sustained interest from threat actors. CVE-2025-26399 continues to be an active part of the threat landscape and will likely remain this way for the forseeable future.

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.

## Timeline

- 2025-09-23: CVE Published. CVE-2025-26399 is published to NVD.
- 2026-03-09: CISA KEV. CVE-2025-26399 is added to the Known Exploited Vulnerabilities catalog by CISA.
- 2026-03-12: CISA Remediation Deadline. Expiration of the CISA remediation deadline as described in [BOD 22-01](https://www.cisa.gov/news-events/directives/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities).
- 2026-08-25: Rule Released. CrowdSec releases a rule to detect CVE-2025-26399 exploitation attempts against the CrowdSec Network.
- 2026-09-03: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2025-26399 for the first time.

## 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

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2025-26399) follows observed exploitation activity for CVE-2025-26399. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.