Exploitation evidence
Known exploited · CISA KEV listed
Added 2026-03-09. Ransomware campaign use: Known.
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.
CISA due date: 2026-03-12. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
SolarWinds / Web Help Desk
Default status: unaffected
- affected: 12.8.7 and below
Fixes and workarounds
SolarWinds recommends customers to upgrade to Web Help Desk version 12.8.7 HF1 as soon as is practical.
Sources and related reporting
CVE Program record ↗ · Download tracked evidence as JSON
- https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399
- https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm
- https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-web-help-desk/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.90564,
"percentile": 0.99805
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.90564,
"percentile": 0.99804
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.90564,
"percentile": 0.99803
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.90564,
"percentile": 0.99803
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.90564,
"percentile": 0.99803
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.90564,
"percentile": 0.99803
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.90564,
"percentile": 0.99803
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.90564,
"percentile": 0.99803
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.90564,
"percentile": 0.99802
}03 Nov 2026, 18:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-26399",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-09-23T00:00:00+00:00",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2026-03-09",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399"
},
"type": "kev"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-04T03:55:57.668Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"third-party-advisory"
],
"url": "https://www.microsoft.com/en-us/security/blog/2026/02/06/active-exploitation-solarwinds-web-help-desk/"
},
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-26399"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-03-09T00:00:00.000Z",
"value": "CVE-2025-26399 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Web Help Desk",
"vendor": "SolarWinds",
"versions": [
{
"status": "affected",
"version": "12.8.7 and below"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"user": "00000000-0000-4000-9000-000000000000",
"value": "Anonymous working with Trend Micro Zero Day Initiative"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "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."
}
],
"value": "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."
}
],
"impacts": [
{
"capecId": "CAPEC-248",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-248: Untrusted Execution Flow"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-502",
"description": "CWE-502: Deserialization of Untrusted Data",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-09-23T05:07:14.702Z",
"orgId": "49f11609-934d-4621-84e6-e02e032104d6",
"shortName": "SolarWinds"
},
"references": [
{
"url": "https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-26399"
},
{
"url": "https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "SolarWinds recommends customers to upgrade to Web Help Desk version 12.8.7 HF1 as soon as is practical."
}
],
"value": "SolarWinds recommends customers to upgrade to Web Help Desk version 12.8.7 HF1 as soon as is practical."
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability",
"x_generator": {
"engine": "Vulnogram 0.1.0-dev"
}
}
},
"cveMetadata": {
"assignerOrgId": "49f11609-934d-4621-84e6-e02e032104d6",
"assignerShortName": "SolarWinds",
"cveId": "CVE-2025-26399",
"datePublished": "2025-09-23T05:07:14.702Z",
"dateReserved": "2025-02-08T00:19:09.395Z",
"dateUpdated": "2026-08-04T03:55:57.668Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.90564,
"percentile": 0.99801
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2025-26399",
"cwes": [
"CWE-502"
],
"dateAdded": "2026-03-09",
"dueDate": "2026-03-12",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Known",
"notes": "https://www.solarwinds.com/trust-center/security-advisories/cve-2025-26399 ; https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_12-8-7-hotfix-1_release_notes.htm ; https://nvd.nist.gov/vuln/detail/CVE-2025-26399",
"product": "Web Help Desk",
"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.",
"shortDescription": "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.",
"vendorProject": "SolarWinds",
"vulnerabilityName": "SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability"
}