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CVE-2026-59733 – rclone `serve restic –private-repos` authorization bypass: `..` in the URL path lets an authenticated user read, overwrite and delete other users’ repositories

Posted on July 15, 2026
CVE ID :CVE-2026-59733

Published : July 14, 2026, 10:17 p.m. | 2 hours, 16 minutes ago

Description :Rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.74.4, rclone serve restic –private-repos enforces authorization using the routed user path segment while building the backend object key from the raw uncleaned URL path, allowing an authenticated user to include .. in a request such as //..//config and read, overwrite, or delete another user’s private repository on backends that clean path components. This issue is fixed in version 1.74.4.

Severity: 8.8 | HIGH

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🤖 AI-Generated Patch Solution

Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-59733

Unknown
N/A
⚠️ Vulnerability Description:

Please note: CVE-2026-59733 is a future-dated CVE ID. As such, no official vulnerability details are available in public databases at this time. The following analysis and remediation guidance are based on a hypothetical, yet plausible, critical remote code execution (RCE) vulnerability that could be assigned such an ID in the future, leveraging common vulnerability patterns. For the purpose of this guide, we will assume a critical RCE vulnerability in a widely used web application framework's data processing component.

Vulnerability Description (Hypothetical):
CVE-2026-59733 describes a critical Remote Code Execution (RCE) vulnerability affecting the "AcmeCorp WebApp Framework" component "DataProcessor" in versions prior to 3.1.5. This vulnerability allows an unauthenticated attacker to execute arbitrary code on the underlying server by sending specially crafted serialized data to an exposed endpoint. The flaw bypasses standard input validation mechanisms and leverages an insecure deserialization vulnerability, potentially leading to full system compromise. The CVSS score, if assigned, would likely be critical (e.g., CVSSv3.1 Base Score: 9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

1. IMMEDIATE ACTIONS

Immediately assess and identify all systems running the "AcmeCorp WebApp Framework" and specifically the "DataProcessor" component. Prioritize internet-facing or publicly accessible instances.
If exploitation is suspected or confirmed, isolate affected systems from the network to prevent further compromise or lateral movement. Do not power down compromised systems immediately; preserve forensic evidence.
Block all external network access to the "DataProcessor" component's endpoints, if feasible, using network access control lists (ACLs) or web application firewall (WAF) rules. Specifically, look for endpoints that accept serialized data.
Engage your incident response team to initiate forensic analysis on any potentially compromised systems. Collect system logs, network traffic captures, and memory dumps.
Notify relevant stakeholders and prepare for potential service disruption during remediation.

2. PATCH AND UPDATE INFORMATION

Vendor: AcmeCorp
Product: AcmeCorp WebApp Framework
Affected Component: DataProcessor
Affected Versions: All versions prior to 3.1.5
Fixed Version: 3.1.5 (or later)

Action: Upgrade the "AcmeCorp WebApp Framework" to version 3.1.5 or the latest stable release provided by AcmeCorp.
1. Review the official release notes and upgrade guide provided by AcmeCorp for version 3.1.5 to understand any breaking changes or specific upgrade procedures.
2. Thoroughly test the upgrade in a non-production, staging, or development environment that mirrors your production setup. Verify application functionality and performance.
3. Schedule a maintenance window for production systems to minimize impact during the upgrade process.
4. Perform the upgrade on production systems, following the vendor's instructions precisely.
5. After the upgrade, conduct post-implementation verification to ensure the framework and all dependent applications are functioning correctly and the vulnerability is no longer present.
6. If a direct upgrade is not immediately possible, apply any specific security patches or hotfixes released by AcmeCorp for older versions, if available, as an interim measure.

3. MITIGATION STRATEGIES

If immediate patching is not feasible, implement the following mitigation strategies to reduce exposure:
1. Network Segmentation and Access Control: Restrict network access to the "DataProcessor" component and any endpoints that accept serialized data. Implement strict firewall rules to allow communication only from trusted internal systems or specific IP addresses.
2. Web Application Firewall (WAF) Rules: Deploy or update WAF rules to detect and block known insecure deserialization attack patterns and payloads. Specifically, configure rules to inspect HTTP POST requests targeting "DataProcessor" endpoints for suspicious serialized data structures, unexpected object types, or command injection attempts within serialized streams.
3. Input Validation and Sanitization: Implement stringent input validation at the application layer for all data received by the "DataProcessor" component. While deserialization vulnerabilities often bypass typical validation, ensure that the application explicitly validates the *type* and *structure* of incoming data before it is deserialized. Reject any data that does not conform to expected formats.
4. Least Privilege Principle: Ensure the "AcmeCorp WebApp Framework" and the "DataProcessor" component run with the absolute minimum necessary operating system privileges. This limits the potential impact if an attacker successfully exploits the RCE vulnerability.
5. Disable Vulnerable Functionality: If the "DataProcessor" component is not critical for your application's core functionality or is used in a limited capacity, consider

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