CVE-2026-7291 Overview
A Server-Side Request Forgery (SSRF) vulnerability has been identified in o2oa up to version 10.0. This affects the FileAction function within the FileAction.java file of the URL Fetching component. By manipulating the fileUrl argument, an attacker can force the server to make arbitrary HTTP requests to internal or external resources. The vulnerability can be exploited remotely by authenticated users, potentially allowing access to internal services, cloud metadata endpoints, or sensitive internal network resources.
Critical Impact
Authenticated attackers can manipulate the fileUrl parameter to perform server-side requests, potentially accessing internal network resources, cloud metadata services, or bypassing network security controls.
Affected Products
- o2oa up to version 10.0
- o2oa FileAction.java URL Fetching component
Discovery Timeline
- 2026-04-28 - CVE CVE-2026-7291 published to NVD
- 2026-04-29 - Last updated in NVD database
Technical Details for CVE-2026-7291
Vulnerability Analysis
This vulnerability is classified as CWE-918 (Server-Side Request Forgery). The FileAction function in o2oa's URL Fetching component fails to properly validate or sanitize user-supplied URLs before making server-side HTTP requests. An authenticated user can supply a malicious fileUrl parameter that directs the server to fetch content from arbitrary locations.
SSRF vulnerabilities in enterprise applications like o2oa are particularly concerning because they can be leveraged to access internal services that are not directly reachable from the internet. Common exploitation targets include cloud metadata endpoints (such as AWS EC2 metadata at 169.254.169.254), internal APIs, administration interfaces, and other backend services protected by network segmentation.
The exploit has been publicly disclosed, increasing the risk of active exploitation in the wild. The project maintainers were informed of the vulnerability through an issue report on GitHub but have not yet responded.
Root Cause
The root cause of this vulnerability is insufficient input validation in the FileAction.java component. The fileUrl parameter accepts user-controlled input without proper sanitization or allowlist validation. The application does not verify that the destination URL points to a legitimate external resource, allowing attackers to specify internal IP addresses, localhost references, or cloud metadata endpoints.
Attack Vector
The attack is network-based and requires low-privilege authentication. An attacker with valid credentials can craft malicious requests containing manipulated fileUrl values pointing to internal network resources. The attack flow typically involves:
- Authentication to the o2oa platform with low-privilege credentials
- Crafting a request to the FileAction endpoint with a malicious fileUrl parameter
- The server processes the request and fetches content from the attacker-specified URL
- Response data from internal resources is returned to the attacker
For technical details on the vulnerability mechanism, refer to the VulDB vulnerability entry and the GitHub issue report.
Detection Methods for CVE-2026-7291
Indicators of Compromise
- Unusual outbound HTTP requests from the o2oa server to internal IP ranges (10.x.x.x, 172.16.x.x, 192.168.x.x)
- Requests to cloud metadata endpoints (169.254.169.254) originating from the application server
- Abnormal fileUrl parameter values in FileAction requests containing localhost, internal hostnames, or IP addresses
- Elevated API activity from specific user accounts targeting the URL Fetching functionality
Detection Strategies
- Implement Web Application Firewall (WAF) rules to detect and block SSRF patterns in the fileUrl parameter
- Monitor application logs for FileAction requests with suspicious URL patterns including internal IP ranges and localhost references
- Deploy network monitoring to identify unexpected outbound connections from the o2oa application server to internal services
- Create SIEM correlation rules to alert on patterns consistent with SSRF exploitation attempts
Monitoring Recommendations
- Enable verbose logging for the URL Fetching component to capture all fileUrl parameter values
- Configure network egress monitoring to detect connections to internal IP ranges from the application tier
- Implement anomaly detection for unusual patterns in FileAction API usage
- Review authentication logs to identify compromised accounts that may be used for exploitation
How to Mitigate CVE-2026-7291
Immediate Actions Required
- Implement URL allowlisting to restrict the fileUrl parameter to trusted external domains only
- Deploy WAF rules to block SSRF attack patterns in incoming requests to the FileAction endpoint
- Consider disabling the URL Fetching functionality if it is not business-critical until a patch is available
- Restrict network egress from the o2oa application server to prevent access to internal services
Patch Information
No official patch is currently available from the o2oa project maintainers. The vulnerability was reported through the GitHub issue tracker, but the project has not yet responded. Monitor the o2oa GitHub repository for security updates.
For additional vulnerability intelligence, refer to the VulDB entry and VulDB CTI report.
Workarounds
- Implement a reverse proxy or WAF rule to validate and sanitize fileUrl parameters before they reach the application
- Configure network segmentation to prevent the o2oa server from accessing sensitive internal resources
- Apply egress filtering to block outbound connections from the application server to internal IP ranges and cloud metadata endpoints
- Restrict access to the FileAction endpoint to only highly trusted users or administrative accounts
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
