Vulnerability intelligence
CVE-2025-26399
SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
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.
CVSS Score
9.8
Critical
EPSS — Exploit Probability
90%
Riskier than 100% of all CVEs · checked 2026-09-08
Exploitation
Confirmed in the wild
Used in ransomware campaigns
Remediation
Patch available
Federal deadline 2026-03-12
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. Deadline for federal agencies: 2026-03-12.
11 articles across 7 outlets · first covered Apr 20, 2026 · latest Apr 20, 2026
Coverage timeline
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Hackers Abuse QEMU for Defense Evasionwww.securityweek.com · Apr 20, 2026
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CISA adds Ivanti CVE-2026-1603 auth bypass to KEV, patch nowwww.securityweek.com · Mar 10, 2026
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CISA Adds KEV Flaws CVE-2021-22054 CVE-2025-26399 CVE-2026-1603securityaffairs.com · Mar 10, 2026
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CISA flags KEV amid active exploits CVE-2025-26399 CVE-2026-1603thehackernews.com · Mar 10, 2026
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CISA KEV flags CVE-2025-26399 in SolarWinds Web Help Deskwww.cisa.gov · Mar 9, 2026
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CISA Adds CVE-2025-26399 to KEV for SolarWinds Web Help Desk RCEcisa.gov · Mar 9, 2026
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SolarWinds WHD Attacks Highlight Risks of Exposed Appswww.darkreading.com · Feb 10, 2026
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Virtual Invasion: SolarWinds WHD Exploited to Host Hidden QEMU VMssecurityonline.info · Feb 10, 2026
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SolarWinds Web Help Desk Exploited for RCE in Multi-Stage Attacks on Exposed Serversthehackernews.com · Feb 9, 2026
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Attackers abuse SolarWinds Web Help Desk to install Zoho agents and Velociraptorsecurityaffairs.com · Feb 9, 2026
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Recent SolarWinds Flaws Potentially Exploited as Zero-Dayswww.securityweek.com · Feb 9, 2026