CVE-2025-40536Known exploitationPublic exploitNetwork attack vectorHinoki check available

Unauthenticated restricted-component access via CSRF whitelist bypass

Published Jan 28, 2026 · Updated Jan 28, 2026

Security control bypass in SolarWinds Web Help Desk 12.8.8 HF1 and earlier allows remote attackers to access restricted components. The checkCsrfTokenWo() filter accepts a bogus query parameter containing /ajax/, bypasses the WebObjects parameter whitelist, and lets wopage instantiate protected component pages such as LoginPref. No authentication is required; the bypass exposes AjaxProxy-backed functionality and can be chained with a separate deserialization flaw for code execution.

CVSS severity8.1
High
EPSS probability81.96%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Security control bypass in SolarWinds Web Help Desk 12.8.8 HF1 and earlier allows remote attackers to access restricted components. The checkCsrfTokenWo() filter accepts a bogus query parameter containing /ajax/, bypasses the WebObjects parameter whitelist, and lets wopage instantiate protected component pages such as LoginPref. No authentication is required; the bypass exposes AjaxProxy-backed functionality and can be chained with a separate deserialization flaw for code execution.

The record

CVE
CVE-2025-40536
Published
Jan 28, 2026
Updated
Jan 28, 2026
Vendor
SolarWinds
Product
Web Help Desk
Classifications
CWE-693, CAPEC-153, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.8.8 HF1 and below

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SolarWinds · Web Help Deskversion=12.8.8 HF1 and below

Published CVSS scores

8.1SolarWindsCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
CAPEC-153Input Data Manipulation
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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