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Vulnerabilities

Vulnerability · CVE-2025-26399

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

Published Sep 22, 2025 · catalog updated Oct 11, 2026 · SolarWinds Web Help Desk

Patch now

CVE-2025-26399 is in the CISA known-exploited catalog, due Mar 12, 2026. Confirm SolarWinds Web Help Desk against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
89.50%
Remediation
Remediation guidance
Affected products
cpe solarwinds/web help desk · vendor SolarWinds Web Help Desk

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

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

How to fix CVE-2025-26399

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-26399 is in the CISA known-exploited catalog, due Mar 12, 2026. Confirm SolarWinds Web Help Desk against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with solarwinds/web help desk 12.8.7. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-502: Deserialization of Untrusted Data. EPSS 89.50%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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.

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

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.