CVE-2025-40536

critical

Description

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.

References

https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-40536

https://www.huntress.com/blog/active-exploitation-solarwinds-web-help-desk-cve-2025-26399

https://www.securityweek.com/cisa-warns-of-exploited-solarwinds-notepad-microsoft-vulnerabilities/

https://thehackernews.com/2026/02/researchers-observe-in-wild.html

https://securityaffairs.com/187937/security/u-s-cisa-adds-solarwinds-web-help-desk-notepad-microsoft-configuration-manager-and-apple-devices-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/02/12/cisa-adds-four-known-exploited-vulnerabilities-catalog

https://www.theregister.com/2026/02/09/solarwinds_mystery_whd_attack/

https://www.securityweek.com/recent-solarwinds-flaws-potentially-exploited-as-zero-days/

https://thehackernews.com/2026/02/solarwinds-web-help-desk-exploited-for.html

https://securityaffairs.com/187761/security/attackers-abuse-solarwinds-web-help-desk-to-install-zoho-agents-and-velociraptor.html

https://thehackernews.com/2026/02/cisa-adds-actively-exploited-solarwinds.html

https://www.securityweek.com/solarwinds-patches-critical-web-help-desk-vulnerabilities/

https://www.helpnetsecurity.com/2026/01/29/solarwinds-web-help-desk-rce-vulnerabilities/

https://thehackernews.com/2026/01/solarwinds-fixes-four-critical-web-help.html

https://securityaffairs.com/187470/security/solarwinds-addressed-four-critical-web-help-desk-flaws.html

https://horizon3.ai/attack-research/cve-2025-40551-another-solarwinds-web-help-desk-deserialization-issue/

https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm#link6

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-40536

https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm

Details

Source: Mitre, NVD

Published: 2026-01-28

Updated: 2026-02-13

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

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