Security readout for executives and security teams
Plain-English summary
A flaw in Windows Media can let a user who already has limited local access run malicious code with serious confidentiality, integrity, and availability impact. The issue is rated high severity, but the supplied evidence does not show active exploitation or a remotely reachable attack path.
Executive priority
Treat this as a high-priority patching issue, especially on multi-user endpoints and servers where local access is broadly available. It does not warrant an active-exploitation emergency designation from the supplied evidence, but successful exploitation could significantly compromise affected systems.
Technical view
CVE-2025-26674 is a heap-based buffer overflow (CWE-122) in Windows Media. Its CVSS 3.1 score is 7.8: local access, low complexity, low privileges, no user interaction, unchanged scope, and high impact across confidentiality, integrity, and availability.
Likely exposure
Potential exposure includes the listed Windows 10, Windows 11, Windows Server 2019, Server 2022, and Server 2025 releases, including specified Server Core installations. Confirm exposure against Microsoft's advisory because the bundle does not provide fixed build or update identifiers.
Exploitation context
The attack requires an authorized attacker with local, low-privileged access; no additional user interaction is required. The supplied record is not in KEV and provides no evidence of active exploitation. Its CVSS vector reports exploit maturity as unproven and remediation as an official fix.
Researcher notes
The title says remote code execution, but the supplied CVSS vector specifies AV:L and the description requires authorized local access. Assessment should therefore follow the documented local prerequisite. Exact vulnerable component behavior, triggering media formats, fixed builds, and KB identifiers are not included in the bundle.
Mitigation direction
- Review Microsoft's CVE advisory for applicable security updates and fixed build information.
- Deploy the applicable Microsoft security updates through normal endpoint and server patching processes.
- Prioritize shared systems where untrusted or lightly trusted users can obtain local access.
- Restrict unnecessary local access while affected systems remain unpatched.
Validation and detection
- Inventory systems running the Windows releases listed in the CVE record.
- Compare installed build and update status with Microsoft's CVE advisory.
- Verify applicable Microsoft security updates installed successfully on endpoints and servers.
- Re-scan patched systems and investigate update failures or unsupported installations.
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-122: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-26674 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/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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9microsoftVulnerability 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/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 Media Remote Code Execution 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.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.