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Back to active CVEs
Critical · CVSS 9.8Known ExploitedCVE-2025-26399

SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation VulnerabilityCVE-2025-26399

Answer in brief

CVE-2025-26399 records a Critical severity (CVSS 9.8) vulnerability in SolarWinds Web Help Desk Deserialization of Untrusted Data Privilege Escalation Vulnerability. The current sources mark it as known exploited. The current feed maps SolarWinds/Web Help Desk (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 23, 2025Updated Oct 11, 2026Source checked Oct 31, 2026First seen by HOL May 24, 2026Material review Oct 11, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.8
Exploitation
Known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.8. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps SolarWinds/Web Help Desk (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:solarwinds:web_help_desk:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:solarwinds:web_help_desk:12.8.7:-:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
SolarWinds/Web Help Deskgeneric12.8.7 and belowNot reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for SolarWinds/Web Help Desk.
  2. 2Review the reported fix. Source-reported solution: SolarWinds recommends customers to upgrade to Web Help Desk version 12.8.7 HF1 as soon as is practical.

Evidence timeline and material changes

  1. Published upstream

    Sep 23, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    May 24, 2026

  4. Added to CISA KEV

    Mar 9, 2026

    Evidence: source:kev:kev:kev:record

Sources and claim methodology

  • Source referencedocumentation.solarwinds.com
  • CISA Known Exploited Vulnerabilities catalogcisa.gov
  • Source referencemicrosoft.com
  • Source referencesolarwinds.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Apache MINA: Unsafe Deserialization (CWE-502) in JavaNativeMessageDecoderAlso CWE-502

Record context

Vulnerability class
Deserialization
EPSS
Not reported
CWE IDs
CWE-502
Source
CVE List V5
Source checked
Oct 31, 2026
References
4 linked sources
Open source record