excel security

Microsoft’s Security Response Center has registered CVE-2026-21259 as a heap‑based buffer overflow in Microsoft Excel that can be turned into a local elevation‑of‑privilege (EoP) condition — a serious class of vulnerability that demands immediate attention from patch and security teams even...

Microsoft’s choice to label CVE-2026-20950 an Excel “Remote Code Execution” vulnerability while publishing a CVSS vector with Attack Vector = Local (AV:L) is deliberate, not a classification error: the CVE title signals the attacker’s origin and the potential operational impact, whereas the CVSS...

Microsoft has assigned CVE-2026-20949 to a Microsoft Excel “Security Feature Bypass” vulnerability disclosed as part of the January 2026 Patch Tuesday cycle; the entry appears in Microsoft's update guidance but — as is common for many office-suite security feature bypass entries — public...

Microsoft’s CVE-2026-20957 advisory names the flaw as a “Microsoft Excel Remote Code Execution Vulnerability,” yet the published CVSS vector lists the Attack Vector as Local (AV:L) — a pairing that looks contradictory until you separate attacker origin and operational impact from the technical...

Microsoft has logged CVE-2026-20949 as a Security Feature Bypass affecting Microsoft Excel, and the entry in the Microsoft Security Response Center’s Update Guide highlights a constrained public description and an explicit report‑confidence signal that security teams must interpret when triaging...

Microsoft’s CVE-2026-20956 for Microsoft Excel is titled a “Remote Code Execution” vulnerability while its published CVSS vector lists the Attack Vector as Local (AV:L)—a pairing that looks contradictory at first glance but is intentional: the CVE title communicates the attacker’s origin and...

Microsoft’s choice of the phrase “Remote Code Execution” in the CVE title for CVE‑2026‑20946 is not a mistake — it’s an operational signal about attacker origin and potential impact — while the CVSS Attack Vector value of AV:L (Local) is a precise, technical statement about where the vulnerable...

Microsoft’s brief CVE title and the CVSS vector are answering two different questions: the CVE headline tells you what an off‑host attacker can ultimately accomplish (arbitrary code execution on a target), while the CVSS Attack Vector (AV) reports where the vulnerable code must be executed at...

Microsoft’s advisory for CVE-2025-62553 identifies a Microsoft Excel vulnerability that can lead to remote code execution when a user opens or previews a specially crafted workbook — but the public record is intentionally terse, and several key technical and per‑SKU details require direct...

Microsoft’s CVE entry for CVE-2025-62203 is labeled a “Remote Code Execution” (RCE) vulnerability for Excel even though the published CVSS vector records the Attack Vector as Local (AV:L) — and that apparent contradiction is intentional, rooted in the difference between impact messaging and...

Microsoft’s CVE entry for CVE-2025-62203 calls the Excel flaw a “Remote Code Execution” vulnerability, but the published CVSS vector marks the Attack Vector as Local (AV:L) — a distinction that looks contradictory at first glance but, in practice, reflects two different questions: what an...

Microsoft’s CVE entry and Microsoft Security Response Center (MSRC) wording for CVE-2025-62201 label the bug as a “Remote Code Execution” (RCE) class vulnerability in Excel while the CVSS vector records the Attack Vector as Local (AV:L), and that apparent contradiction is not an error — it is...

Microsoft’s CVE entry for CVE-2025-59223 describes a Microsoft Excel vulnerability as “Remote Code Execution” while the CVSS vector marks the Attack Vector as Local (AV:L) — those two statements are not contradictory but address different questions: the CVE title communicates what an attacker...

Microsoft has published an advisory for CVE-2025-59232, an out-of-bounds read information‑disclosure vulnerability in Microsoft Excel that can leak process memory when a specially crafted workbook is opened; the vendor released security updates on October 14, 2025 and rates the issue as a...

Microsoft’s advisory confirms an out‑of‑bounds read in Excel that can disclose process memory when a specially crafted workbook is opened, and organizations should treat CVE‑2025‑59235 as a high‑priority patch and containment event until all affected endpoints are updated. Background Microsoft...

Microsoft’s advisory language calling CVE-2025-59231 a “remote code execution” vulnerability is not a clerical error — it’s a deliberate phrasing that describes the attacker’s position and delivery method, not the exact runtime location where exploited code executes; in practice the exploit...

Microsoft has published an advisory for CVE-2025-54900, a heap‑based buffer overflow in Microsoft Excel that can allow an attacker to execute code on a victim machine when a crafted spreadsheet is opened — an issue administrators and home users should treat as high priority for patching and...

Microsoft has published an advisory for CVE-2025-54903, a use‑after‑free vulnerability in Microsoft Excel that can lead to local code execution when a victim opens a specially crafted spreadsheet — a document‑based remote code execution (RCE) risk that should be treated as high priority for both...

Excel is on the verge of a significant security evolution as Microsoft introduces new policy changes designed to clamp down on the enduring threat of malware attacks via external links. Within the coming months, users will see Excel begin blocking references to file types deemed...

For IT professionals, security administrators, and everyday users of Microsoft 365, workbook links have long represented a double-edged sword: a productivity enabler, but also a potential vector for significant risk. Microsoft’s latest announcement signals a pivotal shift in how these links will...