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Exploited vulnerability · CISA KEV

Is CVE-2025-26399 exploited? Yes: in CISA KEV since 9 Mar 2026

Gociux · SolarWinds Web Help Desk · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-26399, SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 9 Mar 2026, 167 days after it was published. It is known to be used in ransomware campaigns. It affects SolarWinds Web Help Desk. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 9 Mar 2026
ransomwareKnownused in campaigns
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due12 Mar 2026BOD 22-01 deadline

What it is

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.

VendorSolarWinds (11 exploited CVEs in KEV)
ProductWeb Help Desk
VulnerabilitySolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
WeaknessCWE-502
Published23 Sep 2025
Added to KEV9 Mar 2026
Reported by (CNA)SolarWinds

What to do

  1. Check whether you run it. Look for Web Help Desk in your asset inventory, including appliances and cloud images. Stack check lists every exploited SolarWinds CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 23 Sep 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for SolarWinds.

Other exploited CVEs in Web Help Desk

References

Questions

Is CVE-2025-26399 being exploited?

Yes. CISA added CVE-2025-26399 to the Known Exploited Vulnerabilities catalog on 9 Mar 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-26399 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2025-26399?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check SolarWinds's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Web Help Desk and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2026 · SolarWinds scorecard · act-now radar.

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