SolarWinds Serv-U Insecure Direct Object Reference (IDOR) Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-28313
StatePUBLISHED
AssignerSolarWinds
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-21 16:17:09 UTC
Updated2026-07-22 19:17:02 UTC
DescriptionSolarWinds Serv-U is affected by an insecure direct object reference (IDOR) vulnerability that can lead to SMTP hijacking leading to arbitrary account takeover. The impact is lower in Windows deployments.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Problem Types: CWE-639 | CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
3.1CNACVSS9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
3.1CNACVSS4.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SolarWinds Serv-U affected 15.5.4 HF1 and below Windows, Linux

References

ReferenceSourceLinkTags
documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_2026-3_re... [email protected] documentation.solarwinds.com
https/www.solarwinds.com/trust-center/security-advisories/CVE-2026-... [email protected] https
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Intigriti Bug Bounty Program (en)

Additional Advisory Data

Solutions

CNA: SolarWinds recommends customers upgrade to Serv-U version 2026.3 as soon as is practical.

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