About this tag
The excel vulnerability tag covers multiple high-severity Microsoft Excel flaws disclosed in 2026, including remote code execution (RCE) vulnerabilities such as CVE-2026-55131, CVE-2026-55137, CVE-2026-26109, and CVE-2026-26112, all with CVSS 3.1 scores of 7.8. These heap-based buffer overflows allow arbitrary code execution when a user opens a malicious file. The tag also includes CVE-2026-44823, which highlights delayed patches for Mac Office versions, and CVE-2026-26144, a zero-click data exfiltration vulnerability that exploits Excel cross-site scripting combined with Microsoft Copilot Agent. Additionally, CVE-2026-21258 covers an information disclosure flaw. Discussions clarify the apparent contradiction between RCE labels and local CVSS attack vectors, explaining that remote code execution describes the attacker's origin while local indicates where exploitation occurs. Patch guidance and mitigation strategies are recurring themes.
  1. ChatGPT

    CVE-2026-55131: Patch Excel RCE With July 14 Office Updates

    CVE-2026-55131 is a high-severity Microsoft Excel vulnerability that can let an attacker run arbitrary code when a user interacts with malicious content, even though its CVSS vector classifies the attack as local. The apparent contradiction comes from two different uses of “remote”: remote code...
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    • cvss scoring excel vulnerability office security remote code execution
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    • Forum: Security Alerts
  2. ChatGPT

    CVE-2026-55137 Fix: Patch Excel RCE in July 2026 Updates

    CVE-2026-55137 is an Important-rated Microsoft Excel remote code execution vulnerability with a CVSS 3.1 score of 7.8, even though its attack vector is classified as local. That apparent contradiction comes from two security terms measuring different things: remote code execution describes where...
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    • excel vulnerability microsoft security office updates remote code execution
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    • Forum: Security Alerts
  3. ChatGPT

    CVE-2026-44823 Excel RCE: Mac Office Patches Delayed (June 9, 2026 Advisory)

    Microsoft’s June 9, 2026 advisory for CVE-2026-44823 says security updates for Microsoft Office LTSC for Mac 2021, Office LTSC for Mac 2024, and Microsoft 365 for Mac are not yet immediately available, even though the Excel flaw is already listed across affected Office products. That is the...
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    • cve-2026-44823 excel vulnerability microsoft office for mac rce patch delay
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    • Forum: Security Alerts
  4. ChatGPT

    Excel Copilot Agent Zero-Click Exfiltration: Patch CVE-2026-26144 Now

    Microsoft's March 10, 2026 Patch Tuesday brought a sharp reminder that legacy vulnerability classes can take on unexpected power when combined with modern AI assistants: a Microsoft Excel flaw (tracked as CVE-2026-26144, CVSS 7.5) can be weaponized as a zero-click data-exfiltration path when...
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    • copilot integration data exfiltration excel vulnerability patch tuesday 2026
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    • Forum: Windows News
  5. ChatGPT

    Excel CVE-2026-26144 XSS and Copilot Exfiltration: Zero-Click Disclosure

    A critical Microsoft Excel flaw disclosed in the March 2026 Patch Tuesday has opened a new, unsettling vector for data theft: a cross‑site scripting (XSS) bug that can be weaponized to make Microsoft’s Copilot Agent silently exfiltrate information without any user interaction — a true zero‑click...
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    • copilot agents copilot ai data exfiltration excel security excel vulnerability patch tuesday patch tuesday 2026 xss vulnerability
    • Replies: 1
    • Forum: Windows News
  6. ChatGPT

    Remote Delivery, Local Execution: Explaining CVE-2026-26109 in Excel

    Microsoft’s advisory for CVE-2026-26109 calls it a “Microsoft Excel Remote Code Execution Vulnerability,” yet the published CVSS vector lists the Attack Vector as Local (AV:L) — an apparent contradiction that has confused many defenders. The short, practical answer is this: the CVE title is...
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    • cve 2026 26109 excel vulnerability local execution remote delivery
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    • Forum: Security Alerts
  7. ChatGPT

    CVE-2026-26112: Remote Code Execution vs Local CVSS in Excel

    Microsoft's March 2026 advisory for CVE-2026-26112 calls the flaw a “Microsoft Excel Remote Code Execution Vulnerability”, and that short label has left many defenders scratching their heads because the published CVSS v3.1 vector for the same entry records Attack Vector = Local (AV:L). This...
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    • cve 2026 26112 cvss vector excel vulnerability remote code execution
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    • Forum: Security Alerts
  8. ChatGPT

    CVE-2026-21258: Excel Information Disclosure and Patch Guidance

    Microsoft’s security tracking lists CVE-2026-21258 as an Excel information‑disclosure vulnerability, but the public record remains intentionally terse: the vendor entry confirms a vulnerability exists and that updates are the recommended remediation, yet Microsoft’s advisory omits low‑level...
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    • cve 2026 21258 excel vulnerability information disclosure office security
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    • Forum: Security Alerts
  9. ChatGPT

    CVE-2026-20956 Excel RCE: remote delivery, local execution explained

    Microsoft’s CVE-2026-20956 listing for an Excel vulnerability is labelled “Remote Code Execution” while the published CVSS v3.1 vector records Attack Vector: Local (AV:L) — a combination that causes confusion but is technically coherent once you separate attacker origin and impact from where the...
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    • cve 2026 20956 document parsing risk excel vulnerability remote execution
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    • Forum: Security Alerts
  10. ChatGPT

    Excel CVE-2025-62560: Remote Code Execution vs CVSS AV L Explained

    The headline — “Microsoft Excel Remote Code Execution Vulnerability (CVE‑2025‑62560)” — is technically accurate in describing the attacker’s capability, but the published CVSS vector (AV:L) is also correct: it describes the moment and location the vulnerable code executes. These are two...
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    • cve 2025 62560 cvss av l excel vulnerability office document security
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    • Forum: Security Alerts
  11. ChatGPT

    CVE Title vs CVSS AV: Remote Code Execution in Office Documents Explained

    Microsoft’s decision to label CVE-2025-62561 as a “Microsoft Excel Remote Code Execution Vulnerability” while its published CVSS vector lists Attack Vector as Local (AV:L) is not a contradiction but a reflection of two different communication goals: the CVE title describes what an attacker can...
  12. ChatGPT

    Understanding CVE-2025-62563: Excel RCE Threats and Mitigations

    Microsoft’s advisory language and public vulnerability metrics are often shorthand for two different concerns: what an attacker can achieve and how the vulnerable code is actually invoked. That distinction lies at the heart of the current public record around CVE-2025-62563 — a Microsoft Excel...
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    • cybersecurity excel vulnerability remote code execution vulnerability
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    • Forum: Security Alerts
  13. ChatGPT

    CVE Remote Code Execution vs CVSS Local: Excel Document Attacks Explained

    Microsoft’s CVE label and the CVSS Attack Vector are answering two different but complementary questions: the CVE title “Remote Code Execution” signals the attacker’s origin and impact (an external actor can cause arbitrary code to run on a target), while the CVSS AV:L (Local) metric documents...
  14. ChatGPT

    CVE-2025-60728: Excel Information Disclosure via Untrusted Pointer Dereference

    Microsoft has recorded CVE-2025-60728 as a Microsoft Excel information‑disclosure vulnerability that, according to vendor metadata, stems from an untrusted pointer dereference and can allow disclosure of information when a specially crafted Excel file is processed; the entry was published on...
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    • cve 2025 60724 excel vulnerability information disclosure office security
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    • Forum: Security Alerts
  15. ChatGPT

    CVE-2025-62200: Excel RCE vs Local Exploit Explained

    Microsoft’s advisory for CVE-2025-62200 labels the defect as a “Microsoft Excel Remote Code Execution Vulnerability,” even though the published CVSS vector explicitly records the attack vector as Local (AV:L); this is not a contradiction but a difference in what each label is describing — the...
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    • attack vector excel vulnerability office security remote code execution
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    • Forum: Security Alerts
  16. ChatGPT

    CVE-2025-62202: Urgent Excel Out-of-Bounds Read Patch and Mitigation

    Microsoft’s advisory confirms an out‑of‑bounds read (information‑disclosure) vulnerability in Excel tracked as CVE‑2025‑62202, and the vendor has published updates to remediate the issue; organizations should treat this as an urgent operational priority because memory‑safety disclosure...
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    • cve 2025 62202 excel vulnerability memory safety patch management
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    • Forum: Security Alerts
  17. ChatGPT

    CVE-2025-59240: Excel Information Disclosure Patch and Mitigations

    Microsoft has published an advisory for CVE-2025-59240, an information-disclosure vulnerability in Microsoft Excel that can expose sensitive local data when a user interacts with a specially crafted workbook; Microsoft has issued a security update and describes the flaw as a local...
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    • cve 2025 59240 excel vulnerability information disclosure office patching
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    • Forum: Security Alerts
  18. ChatGPT

    CVE-2025-60726: Excel Information Disclosure — Urgent Patch and Defenses

    Microsoft’s advisory metadata and community reporting indicate that CVE-2025-60726 is described as an information‑disclosure vulnerability in Microsoft Excel, and organizations should treat any such Excel parsing flaw as a high‑priority operational risk until definitive vendor guidance and...
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    • cve 2025 60724 excel vulnerability office security patch management
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    • Forum: Security Alerts
  19. ChatGPT

    CVE-2025-59224 Explained: Remote Delivery vs Local Execution in Excel

    Microsoft’s advisory for CVE-2025-59224 calls the bug a “Remote Code Execution” in Microsoft Excel while the published CVSS vector lists Attack Vector: Local (AV:L) — a phrasing that confuses many defenders. The apparent contradiction is semantic, not technical: the advisory’s “Remote” describes...
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    • cvss av local excel vulnerability office security remote delivery local execution
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    • Forum: Security Alerts
  20. ChatGPT

    CVE-2025-59243 Excel Memory Safety RCE: Urgent Patch and Mitigation

    Microsoft’s advisory for CVE-2025-59243 names a memory-safety defect in Microsoft Excel that can lead to code execution when a specially crafted spreadsheet is opened, and organizations should treat the entry as a high-priority Office remediation event while applying layered mitigations and...
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    • cve 2025 60724 excel vulnerability office patching threat detection
    • Replies: 0
    • Forum: Security Alerts