CVE-2026-68802 in 365 Apps for Enterprise
Summary
by MITRE • 08/12/2026
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability represents a critical out-of-bounds read flaw within Microsoft Office Excel that enables local attackers to extract sensitive information from memory locations beyond the intended data boundaries. The technical implementation involves improper input validation and memory management within the spreadsheet application's parsing mechanisms, particularly when processing malformed or specially crafted Excel files. Such vulnerabilities typically arise from insufficient bounds checking during array operations or buffer manipulation, allowing malicious code to access memory regions that should remain protected. The flaw manifests when Excel attempts to read data beyond allocated memory segments, potentially exposing confidential information including but not limited to user credentials, system data, or application-specific variables.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates a potential vector for privilege escalation and further exploitation within local environments. Attackers can leverage this weakness to gather sensitive data that may aid in subsequent attacks, such as credential harvesting or system reconnaissance. The vulnerability's local nature means that successful exploitation requires physical access to the target system or execution privileges within the user context, making it particularly concerning in environments where multiple users share systems or where administrative privileges are compromised. This type of flaw falls under the common weakness enumeration CWE-129, which specifically addresses improper validation of length of input buffers, and aligns with attack techniques documented in the attack pattern taxonomy as CWE-754, indicating improper check for bounds of a buffer.
Mitigation strategies must address both immediate protection measures and long-term architectural improvements to prevent similar vulnerabilities from emerging. Organizations should implement comprehensive patch management protocols to ensure timely deployment of Microsoft security updates, while also establishing robust input validation controls within their Excel processing environments. Security monitoring should include detection of anomalous file processing patterns that might indicate exploitation attempts, particularly focusing on unusual memory access behaviors or unexpected data retrieval operations. Additionally, implementing application hardening measures such as address space layout randomization and data execution prevention can significantly reduce the exploitability of such vulnerabilities, while maintaining compliance with industry standards like iso 27001 for information security management and nist cybersecurity framework guidance for risk management.
The vulnerability demonstrates how seemingly minor programming errors in widely-used applications can create significant security risks when exploited by determined attackers. It underscores the importance of rigorous code review processes, automated testing frameworks, and comprehensive security validation procedures during software development lifecycle phases to identify and remediate such memory safety issues before they become exploitable in real-world environments.