Security readout for executives and security teams
Plain-English summary
An authenticated attacker with network access could misuse an exposed Windows Local Session Manager function to make an affected system unavailable. The issue threatens service continuity, not data confidentiality or integrity. Servers supporting business-critical workloads deserve prompt attention because successful exploitation could cause operational disruption.
Executive priority
Treat this as a normal-priority security update with elevated urgency for critical servers. It does not warrant emergency response based on supplied exploitation evidence, but delayed remediation leaves authenticated attackers a potential path to disrupt services.
Technical view
CVE-2025-26651 is a CWE-749 exposed-function weakness in Windows LSM. Its CVSS 3.1 score is 6.5: network-reachable, low complexity, low privileges, no user interaction, unchanged scope, and high availability impact. The supplied evidence does not describe the precise failure mechanism.
Likely exposure
Potential exposure includes the listed Windows 11 22H2, 22H3, 23H2, and 24H2 systems, plus Windows Server 2022, Server 2022 23H2 Core, and Server 2025 installations. Confirm exact applicability and security-update status through Microsoft’s advisory; the bundle does not provide corrected build numbers.
Exploitation context
The CVSS vector indicates exploitation requires low privileges but no user interaction and can occur over a network. The CVE is not listed as KEV, and the supplied sources provide no evidence of active exploitation or public exploit availability.
Researcher notes
The record classifies the flaw as CWE-749 and provides no technical root-cause detail, affected component interface, indicators, or proof-of-concept information. Product naming includes overlapping Windows 11 22H3 and 23H2 entries. Researchers should rely on Microsoft’s advisory for authoritative applicability and corrected builds.
Mitigation direction
- Review Microsoft’s CVE advisory for applicable security updates and corrected build details.
- Prioritize updates on exposed or business-critical Windows servers.
- Apply applicable Microsoft security updates through established change-management procedures.
- Restrict unnecessary network access from low-privileged accounts while remediation is pending.
Validation and detection
- Inventory systems running the Windows editions and build families listed in the advisory.
- Compare installed update and build information with Microsoft’s CVE guidance.
- Confirm applicable security updates installed successfully and survived restart requirements.
- Monitor affected systems for unexplained session-service failures or availability incidents.
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-749: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2025-26651 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
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
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.
SSVC decision data
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:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C2.83.6microsoftVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Windows Local Session Manager (LSM) Denial of Service VulnerabilityCVE reference, microsoft · vendor-advisory, patch
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.
Exposed Dangerous Method or Function
Exposed Dangerous Method or Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.