Security readout for executives and security teams
Plain-English summary
CVE-2026-26113 is a high-severity Microsoft Office remote code execution issue. Microsoft says an untrusted pointer dereference can let an unauthorized attacker execute code locally. The source bundle lists Office, Microsoft 365 Apps, Office for Mac LTSC, and SharePoint Server products as affected. Microsoft has published advisory and patch information.
Executive priority
Treat this as a near-term patching priority for Microsoft productivity and collaboration environments. No active exploitation is evidenced in the provided sources, but the impact rating is high and Microsoft lists official remediation.
Technical view
The vulnerability is mapped to CWE-822: untrusted pointer dereference. The provided CVSS 3.1 score is 8.4 with local attack vector, low complexity, no privileges, and high confidentiality, integrity, and availability impact. Microsoft’s advisory is the authoritative source for exact affected builds and update guidance.
Likely exposure
Organizations running the listed Microsoft Office, Microsoft 365 Apps for Enterprise, Office LTSC for Mac, or SharePoint Server versions may be exposed until Microsoft’s applicable updates are applied.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates local attack vector and no user interaction, but the public details provided do not describe a full exploitation path.
Researcher notes
Public information is limited to the CVE description, CWE, CVSS, affected products, and Microsoft advisory. Do not assume exploitation mechanics beyond the stated local code execution from untrusted pointer dereference. Validate exposure using Microsoft’s update guide rather than inferred version ranges.
Mitigation direction
- Review Microsoft’s CVE-2026-26113 advisory for affected builds and update packages.
- Apply Microsoft security updates for all affected Office and SharePoint products.
- Prioritize systems handling sensitive documents or hosting SharePoint services.
- Monitor Microsoft advisory revisions for supersedence or additional mitigation guidance.
Validation and detection
- Inventory installed Office, Microsoft 365 Apps, Office for Mac, and SharePoint versions.
- Compare installed versions against Microsoft’s advisory for CVE-2026-26113.
- Confirm relevant security updates are installed successfully.
- Check vulnerability management tools for authenticated detection coverage.
- Monitor CISA KEV and Microsoft MSRC for exploitation-status changes.
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-822: 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-2026-26113 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
- 8.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/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.
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:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C2.55.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.4HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft Office Remote Code Execution VulnerabilityCVE reference · 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.
Untrusted Pointer Dereference
Untrusted Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.