CVE-2025-26399 kev+ ransomware in the critical feed json
SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability
published last yr. modified 29d ago also EUVD-2025-30842
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2026-03-09, used in ransomware
- epss
- 90.6%
- EPSS 90.6% chance of exploitation in 30 days, percentile 99.8%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
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.
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Check with FencerTimeline
- CISA SSVC: exploitation active
- Published
- Added to CISA KEV
- CISA patch deadline
Known exploited
- Added
- 8mo ago
- Patch by
- 2026-03-12 (7mo ago)
- Ransomware
- Known to be used in ransomware campaigns
- 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.
- Vendor, product
- SolarWinds, Web Help Desk
- CISA name
- SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- yes
- Technical impact
- total
- Assessed
- last yr.
Exploit prediction
90.56% chance of exploitation in the next 30 days, higher than 99.8% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- Nuclei template SolarWinds Web Help Desk < 12.8.7 - AjaxProxy Deserialization RCE nuclei detection template
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- SolarWinds Web Help Desk
Classification
- Weakness
-
- CWE-502 Deserialization of Untrusted Data
References
-
solarwinds.com
/trust-center/security-advisories/CVE-2025-26399
patch, vendor-advisory
-
documentation.solarwinds.com
/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm
release-notes
-
microsoft.com
/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-web-help-desk/
third-party-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399
government-resource, us-government-resource
Sources
- CVE List CVE-2025-26399
- NVD CVE-2025-26399
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