Security readout for executives and security teams
Plain-English summary
A memory-handling flaw in listed Microsoft Office and SharePoint products could let an unauthorized attacker run code with serious confidentiality, integrity, and availability consequences. The CVSS vector indicates that exploitation requires local access conditions and user interaction, limiting remote automation but not the potential impact after successful exploitation.
Executive priority
Treat remediation as a high-priority patching activity because successful exploitation could enable code execution and broad business impact. Prioritize critical systems and exposed user populations, while recognizing that the supplied evidence does not support declaring an active-exploitation emergency.
Technical view
CVE-2026-45475 is a heap-based buffer overflow, classified as CWE-122. It carries CVSS 3.1 score 7.8 with low attack complexity, no privileges required, user interaction required, and high impact across confidentiality, integrity, and availability. The supplied sources do not describe the triggering input or execution context.
Likely exposure
Exposure includes the listed Microsoft 365 Apps, Office 2016/2019, Office LTSC 2021/2024, corresponding Mac editions, and SharePoint Server editions. The supplied version identifiers are broad and lack affected build ranges, so organizations should determine exposure using Microsoft's advisory rather than relying solely on those identifiers.
Exploitation context
The CVSS vector specifies a local attack vector and required user interaction. CISA KEV status is false in the supplied bundle, and no cited source establishes active exploitation or public exploit availability. Exact delivery and triggering methods are not provided.
Researcher notes
The public bundle confirms CWE-122 and the CVSS vector but omits root-cause depth, triggering formats, affected build boundaries, privileges gained, and proof-of-concept status. SharePoint products are listed alongside Office products without product-specific exploitation details. Consult Microsoft for authoritative build applicability and fixes.
Mitigation direction
- Apply the Microsoft security updates identified in the MSRC advisory for each deployed product and platform.
- Review Microsoft guidance for product-specific prerequisites, update sequencing, and any documented interim mitigations.
- Prioritize affected systems handling untrusted content or supporting business-critical operations.
Validation and detection
- Inventory installations of every listed Office, Microsoft 365 Apps, Mac, and SharePoint product.
- Compare installed builds and update status with the current MSRC advisory for CVE-2026-45475.
- Confirm security updates installed successfully across representative endpoints and servers.
- Re-scan managed assets and investigate systems that remain outdated or cannot receive the vendor update.
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-2026-45475 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:N/UI:R/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:N/UI:R/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:N/UI:R/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
- Microsoft Office 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.