CVE-2026-55047 in Office
Summary
by MITRE • 07/14/2026
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical out-of-bounds read flaw within Microsoft Office applications that enables unauthorized attackers to potentially access sensitive information on compromised systems. The technical nature of this issue stems from improper input validation and memory management within the office suite's processing routines, where insufficient bounds checking allows malicious code to read memory locations beyond allocated buffers. Such vulnerabilities typically arise when applications fail to properly validate user-supplied data or file contents before processing them, creating opportunities for attackers to manipulate program execution flow. The flaw manifests when Office applications encounter specially crafted files or malformed content that triggers the out-of-bounds memory access condition. This type of vulnerability falls under the common weakness enumeration CWE-125 which specifically addresses out-of-bounds read conditions in software implementations. From an operational perspective, successful exploitation of this vulnerability could enable attackers to extract sensitive data from memory segments including credentials, encryption keys, or other confidential information stored within the application's memory space. The local information disclosure aspect suggests that the attack vector likely involves tricking a user into opening a malicious file or document, followed by the execution of code that leverages the out-of-bounds read to access restricted memory areas. This vulnerability aligns with several tactics described in the mitre att&ck framework including initial access through social engineering and privilege escalation techniques. The impact extends beyond simple information disclosure as the leaked memory contents could potentially include session tokens, cryptographic materials, or other sensitive data that could be leveraged for further attacks within the compromised environment. The vulnerability's classification as local information disclosure indicates that while it may not directly enable remote code execution, it can serve as a stepping stone for more sophisticated attacks by providing attackers with valuable insights into system memory structures and application behavior. Organizations should prioritize immediate patch management to address this vulnerability, as the potential for exploitation increases with the sophistication of attack techniques available to threat actors. Security teams must also implement monitoring solutions that can detect anomalous file processing behaviors or memory access patterns that may indicate attempted exploitation of this class of vulnerability. The remediation approach should include regular security updates, user education regarding suspicious file attachments, and network segmentation measures to limit the potential impact if exploitation occurs. Additionally, implementing application whitelisting policies and restricting user privileges can significantly reduce the attack surface and mitigate the operational impact of such vulnerabilities in enterprise environments.