CVE-2025-26399

CVE Enrichment

CVSS: 9.8 CRITICAL
EPSS: 89.50%
EPSS Percentile: 99.79%
CISA KEV: YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: psirt@solarwinds.com
Published: 23-Sep-2025 12:15
Last Modified: 12-Oct-2026 03:10
EPSS Date: 2026-10-16
CWE: CWE-502

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:H /
                            I:H /
                            A:H

CISA KEV Details

Date Added: 2026-03-09
Remediation Due: 2026-03-12
Known Ransomware Campaign Use: Known
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.
Notes: 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://nvd.nist.gov/vuln/detail/CVE-2025-26399

Affected Products / Versions

solarwinds / web_help_desk
Version / affected range: * · through (inclusive) 12.8.6
cpe:2.3:a:solarwinds:web_help_desk:*:*:*:*:*:*:*:*
solarwinds / web_help_desk
Version / affected range: 12.8.7
cpe:2.3:a:solarwinds:web_help_desk:12.8.7:-:*:*:*:*:*:*

References

Last enrichment sync: 17-Oct-2026 12:19
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

-- CVE-2025-40551 was recently added to CISA’s Known Exploited Vulnerabilities database, and CVE-2025-26399 was just recently discussed by Microsoft and other vendors who have also observed active in-the-wild Huntress Details Active Exploitation of SolarWinds Web Help Desk

CVE (2)

People (1)

MITRE ATT&CK (11)

Vendors (3)

Products (6)

Tools (4)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.