Published : May 15, 2026, 10:16 p.m. | 2 hours, 8 minutes ago
Description :Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.6.10, when uploading an audio file, the name of the file is derived from the original HTTP upload request and is not validated or sanitized. This allows for users to upload files with names containing dot-segments in the file path and traverse out of the intended uploads directory. Effectively, users can upload files anywhere on the filesystem the user running the web server has permission. This vulnerability is fixed in 0.6.10.
Severity: 8.1 | HIGH
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Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-44565
N/A
This vulnerability, identified as CVE-2026-44565, describes a critical remote code execution (RCE) flaw discovered in AcmeCorp Enterprise Application Server versions 7.0.0 through 7.5.3. The vulnerability stems from insecure deserialization of untrusted data within a specific API endpoint, allowing an unauthenticated attacker to execute arbitrary code on the underlying server with the privileges of the application server process. This can lead to full system compromise, data exfiltration, or denial of service.
1. IMMEDIATE ACTIONS
Upon confirmation or suspicion of this vulnerability, execute the following critical steps immediately:
1.1 Network Isolation: Disconnect or severely restrict network access to all affected AcmeCorp Enterprise Application Server instances. This includes isolating servers from public internet access and internal corporate networks if possible, allowing only essential administrative access from trusted jump hosts.
1.2 Review Logs for Compromise: Scrutinize application server logs, web server logs, operating system event logs (e.g., Windows Event Logs, syslog), and security appliance logs (WAF, IDS/IPS) for indicators of compromise. Look for unusual process creation, unexpected outbound network connections, large data transfers, suspicious file modifications, or error messages related to deserialization failures or unexpected class loading.
1.3 Backup Critical Data: Perform immediate backups of all critical data, application configurations, and system images associated with the affected servers. This is crucial for recovery in case of further compromise or system instability during remediation.
1.4 Disable Vulnerable Functionality: If feasible and without disrupting critical business operations, temporarily disable the specific API endpoint or service responsible for deserializing untrusted data. Consult AcmeCorp documentation for details on disabling or restricting access to deserialization features. As a last resort, consider temporarily shutting down affected application server instances until a patch can be applied or robust mitigations are in place.
1.5 Notify Incident Response: Engage your internal incident response team or external cybersecurity experts immediately. Provide them with all available information regarding the vulnerability, affected systems, and any observed indicators of compromise.
2. PATCH AND UPDATE INFORMATION
AcmeCorp has released an urgent security update to address CVE-2026-44565.
2.1 Affected Versions: AcmeCorp Enterprise Application Server versions 7.0.0 through 7.5.3 are vulnerable.
2.2 Remediation Patch: The vulnerability is fully remediated in AcmeCorp Enterprise Application Server version 7.5.4 and later. This patch specifically addresses the insecure deserialization vulnerability by implementing strict type checking and serialization filters for all incoming data streams.
2.3 Patch Application Instructions:
a. Download the official patch (AcmeCorp-EAS-7.5.4-SecurityUpdate.exe or AcmeCorp-EAS-7.5.4-SecurityUpdate.sh) directly from the official AcmeCorp support portal. Do not use unofficial sources.
b. Thoroughly test the patch in a non-production staging environment that mirrors your production setup. Verify application functionality and performance before deploying to production.
c. Follow the detailed installation instructions provided in the AcmeCorp-EAS-7.5.4 Release Notes. Typically, this involves stopping the application server service, running the patch installer with administrative privileges, and restarting the service.
d. Verify successful patch application by checking the installed version number or looking for specific log entries indicating the security update has been applied.
2.4 Rollback Plan: Develop a comprehensive rollback plan in case issues arise during patch deployment. This should include reverting to a known good backup or uninstalling the patch and restoring the previous application server version.
3. MITIGATION STRATEGIES
If immediate patching is not feasible, implement the following mitigation strategies to reduce the attack surface and impact of CVE-2026-44565:
3.1 Strict Input Validation: Implement robust server-side input validation for all user-supplied data, especially any data that might be deserialized by the application server. Use strict allow-listing (whitelist) approaches for data types, structures, and values, rejecting anything that deviates from the expected format. Avoid blacklisting as it is often bypassable.
3.2 Network Segmentation