{"id":"CVE-2025-26399","kind":"vulnerability","aliases":["CVE-2025-26399"],"related":[],"title":"SolarWinds Web Help Desk was found to be susceptible to an unauthenticated AjaxProxy deserialization remote code…","description":"SolarWinds Web Help Desk contain a deserialization of untrusted data vulnerability in AjaxProxy that could allow an attacker to run commands on the host machine.\n\nCISA 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.","summary":"SolarWinds Web Help Desk has a deserialization flaw in its AjaxProxy component that accepts untrusted data. An attacker who can reach the service can run commands on the host machine.","severity":"critical","cvss":9.8,"epss":null,"exploited":true,"exploited_at":"2026-03-09T00:00:00+00:00","products":[{"name":"SolarWinds Web Help Desk","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"solarwinds web help desk","fixed":[],"affected":"<= 12.8.6","ecosystem":"vendor"},{"name":"solarwinds web help desk","fixed":[],"affected":"= 12.8.7","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","ransomware","self-hosted","solarwinds","vendor","web-help-desk"],"not_affected_if":["not-running-web-help-desk"],"how_to_check":null,"fix":"Apply the vendor mitigations per SolarWinds instructions, or discontinue use of the product if mitigations are unavailable (per CISA KEV required action). Exact fixed version: unknown","status":"open","published_at":"2025-09-23T05:15:35+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:39:11+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"vendor","confidence":0.6,"triage":{"at":"2026-10-23T20:39:11Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor mitigations per SolarWinds instructions, or discontinue use of the product if mitigations are unavailable (per CISA KEV required action). Exact fixed version: unknown","reach":"network","summary":"SolarWinds Web Help Desk has a deserialization flaw in its AjaxProxy component that accepts untrusted data. An attacker who can reach the service can run commands on the host machine.","category":"vendor","who_cares":["solarwinds","web-help-desk","self-hosted"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker runs arbitrary commands on the Web Help Desk host server","analyst_note":"Pull the SolarWinds advisory and the affected/fixed version list, and find the vendor mitigation steps and a way to check for exploitation (ransomware use is flagged in KEV).","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["not-running-web-help-desk"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000444,"input_tokens":2559,"output_tokens":377,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':113C '-2025':18A,21A '-26399':19A,22A '22':112C 'accept':59B 'action':103C 'ajaxproxi':13A,56B,88C 'allow':91C 'appli':104C 'applic':110C 'attack':63B,93C 'bod':111C 'cisa':101C 'cloud':116C 'code':16A 'command':71B,96C 'compon':57B 'contain':80C 'could':90C 'cve':17A,20A 'data':61B,85C 'deseri':14A,52B,82C 'desk':4A,26A,30A,34A,45B,49B,79C 'discontinu':119C 'exploit':35B 'flaw':53B 'follow':109C 'found':6A 'guidanc':114C 'help':3A,25A,29A,33A,44B,48B,78C 'host':39B,74B,99C 'instruct':108C 'machin':75B,100C 'mitig':105C,125C 'per':106C 'product':123C 'ransomwar':36B 'reach':66B 'remot':15A 'requir':102C 'run':70B,95C 'self':38B 'self-host':37B 'servic':68B,117C 'solarwind':1A,40B,46B,76C 'solarwinds':23A,27A,31A 'suscept':9A 'unauthent':12A 'unavail':127C 'untrust':60B,84C 'use':120C 'vendor':41B,107C 'vulner':86C 'web':2A,24A,28A,32A,43B,47B,77C 'web-help-desk':42B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2025-09-23T05:15:35+00:00","kev":{"dateAdded":"2026-03-09","dueDate":"2026-03-12","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"psirt@solarwinds.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2025-26399","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-26399","severity":null,"published_at":"2026-03-09T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T14:39:38+00:00","note":null},{"source":"nvd","external_id":"CVE-2025-26399","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-26399","severity":null,"published_at":"2025-09-23T05:15:35+00:00","modified_at":"2026-10-11T20:10:00+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}