SolarWinds Web Help Desk AjaxProxy Java Deserialization RCE
CVE-2024-28986 is a critical remote code execution vulnerability in SolarWinds Web Help Desk (WHD) caused by unsafe Java deserialization in the AjaxProxy functionality. The issue allows attacker-controlled data sent to the AjaxProxy endpoint to be deserialized and used to execute commands on the underlying host. Multiple supporting references in the provided content describe the flaw as an AjaxProxy deserialization issue in WHD and note that it was initially reported as unauthenticated/pre-auth remote code execution, although SolarWinds stated it could not reproduce exploitation without authentication during its own testing. The vulnerability was significant enough that later issues, including CVE-2024-28988 and CVE-2025-26399, were described as patch bypasses of this original flaw, indicating the underlying deserialization attack surface was not fully remediated in early fixes.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
35 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An older Java deserialization vulnerability referenced as having been exploited in the wild soon after being patched; CVE-2025-26399 is described as a bypass to it.
Prior SolarWinds Web Help Desk vulnerability whose patches can be bypassed by CVE-2025-26399 (details not provided in the content).
An earlier SolarWinds Web Help Desk vulnerability referenced as the original issue underlying later patch-bypass iterations (including CVE-2024-28988 and CVE-2025-26399).
The original SolarWinds Web Help Desk vulnerability in the lineage that later saw an incomplete fix (CVE-2024-28988) and a subsequent bypass (CVE-2025-26399).
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.