CVE-2026-59265 in OpenOffice
Summary
by MITRE • 10/02/2026
A code execution issue in the Java integration in Apache OpenOffice v4.1.16 and earlier allows a crafted untrusted document to trigger executing arbitrary (even remote) code when opened by the user.
This issue is expected to be fixed in version 4.1.17, which is in the release candidate phase.
Until then, users can mitigate this issue by disabling Java runtime integration in the Preferences dialog. This prevents the attack. If this is not possible, or as an extra precaution, you can avoid opening open untrusted files entirely. Once 4.1.17 is released, upgrade to that version to fix the issue.
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Analysis
by VulDB Data Team • 10/02/2026
The vulnerability identified in Apache OpenOffice versions prior to 4.1.16 represents a critical code execution flaw within the application's Java integration subsystem. This security defect allows an attacker who crafts a malicious document containing specific triggers related to Java scripting or embedded objects to achieve arbitrary code execution on the victim's system. The core of the issue lies in how OpenOffice handles untrusted content that invokes the Java runtime environment. When a user opens such a crafted file, the application fails to properly isolate or validate the Java operations initiated by the document, thereby allowing external commands or scripts embedded within the malicious payload to execute with the privileges of the current user. This capability extends beyond local execution, as attackers can leverage this flaw to download and run remote payloads, effectively turning an open office document into a vector for initial system compromise.
From a technical perspective, this vulnerability aligns with CWE-94, which describes Improper Control of Generation of Code (Code Injection). The failure stems from insufficient validation or sanitization of inputs that are passed to the Java interpreter within the OpenOffice environment. By exploiting this weakness, an adversary can bypass standard security boundaries inherent in office applications, leading to a complete loss of confidentiality and integrity for the affected system. In terms of offensive cybersecurity frameworks, this attack vector is consistent with MITRE ATT&CK technique T1204, User Execution, where malware relies on user interaction to run malicious code. Specifically, it falls under sub-techniques involving document files or macros that trick users into opening them, thereby initiating the exploitation chain without requiring direct command-line access by the attacker at the time of execution.
The operational impact of this vulnerability is severe due to its reliance on social engineering tactics inherent in phishing campaigns and malicious file distribution. Since the exploit requires the user to open a document, it targets human behavior rather than just software misconfiguration alone. Once executed, the arbitrary code can perform a wide range of destructive actions depending on the attacker's intent. These may include installing backdoors for persistent access, stealing sensitive data such as credentials or financial records, deploying ransomware to encrypt files, or pivoting further into internal networks if the compromised machine has network connectivity. The ability to execute remote code significantly amplifies the risk, allowing attackers to dynamically update their payloads and evade static signature-based detection mechanisms that might otherwise identify a fixed malicious file hash.
Mitigation strategies for this vulnerability focus on reducing the attack surface by disabling the vulnerable component until an official patch is available. Users are advised to navigate to the Preferences dialog within Apache OpenOffice and disable Java runtime integration entirely. This action prevents the application from invoking the Java interpreter when processing documents, thereby neutralizing the specific code path exploited by this flaw. For environments where disabling Java is not feasible due to legitimate business requirements relying on Java-based macros or extensions, alternative precautions must be employed. These include implementing strict email filtering rules to block attachments with suspicious file types, using sandboxing solutions to analyze untrusted files in isolated environments before opening them, and enforcing a policy that prohibits the opening of documents from unknown or unverified sources.
The definitive resolution for this issue is provided by upgrading Apache OpenOffice to version 4.1.17 or later. This release incorporates code changes designed to properly validate inputs and restrict unauthorized execution contexts within the Java integration layer. Organizations should prioritize patching their workstations and servers running affected versions as soon as the stable release of 4.1.17 becomes available. In addition to software updates, maintaining a robust incident response plan is essential for detecting potential compromises resulting from this vulnerability. Security teams should monitor for unusual process creation events related to Java executables spawned by office applications and review network logs for connections initiated by OpenOffice processes that deviate from normal behavioral patterns. Continuous monitoring and timely patching remain the most effective defenses against such document-based exploitation techniques.