CASCACascade Atlas

Evidence dossier

CVE-2025-26399

SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability

83.3–98.3Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Sep 23, 2025
Updated
Mar 10, 2026
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS88.33%

2026-07-18 · v2026.06.15 · percentile 99.8%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

SolarWindsoriginal assertion
container

SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability

CISA KEVoriginal assertion
observed_exploitation

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.883300000000; percentile 0.997530000000

Applicability

Cited product scope

Trace impact →
SolarWindsWeb Help Desk
[{"status": "affected", "version": "12.8.7 and below"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:solarwinds:web_help_desk:*:*:*:*:*:*:*:*; end including 12.8.6supported
Unknown vendorUnknown product
cpe:2.3:a:solarwinds:web_help_desk:12.8.7:-:*:*:*:*:*:*supported

Assessments

CVSS by origin

9.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
psirt@solarwinds.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
SolarWindsCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.