ZeroDay Findings
Sign inSign up

Findings

Vulnerability · CVE-2025-26399

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

Published Sep 22, 2025 · corrected/updated Oct 11, 2026 · SolarWinds Web Help Desk · evidence confidence very high

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.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2025-26399 is a critical public vulnerability record for SolarWinds Web Help Desk. CISA lists it as known exploited. Published remediation guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether SolarWinds Web Help Desk is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: solarwinds/web help desk; solarwinds/web help desk (12.8.7); SolarWinds Web Help Desk. Published remediation guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 9.8, EPSS 89.5%. CISA lists it as known exploited. Weakness classes: CWE-502. Sources contributing to this record: cisa_kev, cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Confirmed in CISA KEV since Jan 20, 2026. Listed in CISA KEV and VulnCheck KEV.

  • Patch and remediation

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA due date Mar 12, 2026.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 22, 2025 · Catalog

    Detected

    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.

  2. Mar 9, 2026 · CISA KEV

    Known exploited

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

  3. Mar 12, 2026 · CISA KEV

    Remediation due

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

  4. Oct 11, 2026 · Catalog

    Updated

    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.

Affected

  • cpe solarwinds/web help deskversion unspecified
  • cpe solarwinds/web help desk12.8.7
  • vendor SolarWinds Web Help Deskversion unspecified

Sources

  • CISA KEVConfirmed exploitationCVE-2025-26399

    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.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2025-26399

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-26399

    30-day exploitation probability 89.5%

    first.org
  • NIST NVDVulnerability recordCVE-2025-26399

    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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2025-26399

    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.

    vulncheck.com

References