Security readout for executives and security teams
Plain-English summary
CVE-2026-23856 is a Dell iDRAC Service Module vulnerability that can let a low-privileged local user gain higher privileges. It affects iSM for Windows before 6.0.3.1 and iSM for Linux before 5.4.1.1. This matters most on servers where local accounts, administrators, or workloads could be abused after initial access.
Executive priority
Treat as a high-priority server hygiene issue, especially for sensitive Dell-managed infrastructure. It is not described as remotely exploitable, but it can increase damage after an attacker gains a foothold. Prioritize updating affected servers during the next urgent maintenance window.
Technical view
The issue is Improper Access Control (CWE-284) in Dell iDRAC Service Module. CVSS 3.1 is 7.8, with local attack vector, low complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact. The CVE record identifies affected Windows and Linux iSM versions prior to the fixed releases.
Likely exposure
Exposure is limited to systems running Dell iDRAC Service Module for Windows before 6.0.3.1 or Linux before 5.4.1.1. The attacker needs local access and low privileges, so internet-facing exploitability is not indicated by the provided sources.
Exploitation context
No active exploitation is indicated in the provided sources, and the CVE is not marked as CISA KEV. The realistic scenario is post-compromise privilege escalation by someone who already has local access to an affected server.
Researcher notes
The public data identifies the weakness class, CVSS vector, local privilege-escalation conditions, and fixed version thresholds. The bundle does not provide technical root cause detail, proof-of-concept status, or exploit indicators. Avoid assuming broader Dell iDRAC firmware exposure; this CVE is for iDRAC Service Module.
Mitigation direction
- Upgrade Dell iDRAC Service Module for Windows to 6.0.3.1 or later.
- Upgrade Dell iDRAC Service Module for Linux to 5.4.1.1 or later.
- Review Dell advisory DSA-2026-077 for environment-specific update guidance.
- Restrict local interactive and service account access on affected servers until updated.
Validation and detection
- Inventory servers running Dell iDRAC Service Module.
- Check installed iSM version on Windows and Linux hosts.
- Flag Windows iSM versions earlier than 6.0.3.1.
- Flag Linux iSM versions earlier than 5.4.1.1.
- Confirm remediation against Dell advisory DSA-2026-077.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-23856 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.dell.com/support/kbdoc/en-us/000426282/dsa-2026-077-security-update-for-dell-idrac-service-module-vulnerabilityCVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.