CVE-2025-40536: SolarWinds Web Help Desk Security Control Bypass Vulnerability

What it is

SolarWinds Web Help Desk was found to be susceptible to a security control bypass vulnerability that if exploited, could allow an unauthenticated attacker to gain access to certain restricted functionality.

Exploitation evidence

First exploit evidence seen: 2026-01-28 (earliest date across the sources below).

Exploited in the wild

• CISA KEV: listed since 2026-02-12. Source

Public exploit code

Metasploit

• exploit/multi/http/solarwinds_webhelpdesk_rce: SolarWinds Web Help Desk unauthenticated RCE (disclosure 2026-01-28)

GitHub proof-of-concept repositories below quality bar

1 public repositories from 1 accounts, first seen 2026-06-01.

Verify before running: public PoCs can be malicious. Read the code and only run it in an isolated lab. A PoC means exploit code is public, not that this CVE is exploited in the wild.

Sources: CISA KEV · Rapid7 Metasploit Framework module metadata · nomi-sec/PoC-in-GitHub.

How to fix it

CISA 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. (source: CISA KEV)

Fixed versions

• solarwinds web help desk: upgrade to 2026.1 or later

Derived from the NVD CPE configuration (versionEndExcluding / versionEndIncluding). Always confirm with the vendor advisory.

Vendor advisories and patches

• https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm (CISA KEV notes)
• https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-40536 (CISA KEV notes)

MITRE ATT&CK mitigations for this chain

• M1050 Exploit Protection (for T1211) : Security applications that look for behavior used during exploitation such as Windows Defender Exploit Guard (WDEG) and the Enhanced Mitigation Experience Toolkit (EMET) can be used to mitigate some exploitation behavior. Control flow integrity checking is another way to potentially identify and stop a software exploi
• M1051 Update Software (for T1211) : Update software regularly by employing patch management for internal enterprise endpoints and servers.
• M1019 Threat Intelligence Program (for T1211) : Develop a robust cyber threat intelligence capability to determine what types and levels of threat may use software exploits and 0-days against a particular organization.
• M1048 Application Isolation and Sandboxing (for T1211) : Make it difficult for adversaries to advance their operation through exploitation of undiscovered or unpatched vulnerabilities by using sandboxing. Other types of virtualization and application microsegmentation may also mitigate the impact of some types of exploitation. Risks of additional exploits and weaknesses in t

Detection Generic guidance

Response checklist Generic guidance

1. Inventory: find every instance of the affected product and version (include internet-facing and forgotten ones).
2. Patch or mitigate per the vendor advisory; if you cannot patch, remove internet exposure or apply the vendor workaround.
3. Assume compromise if the system was exposed before patching: hunt for the indicators in the advisory and review logs back to the disclosure date.
4. Rotate credentials and secrets stored on or used by the affected system if compromise cannot be ruled out.