CVE-2025-8051: Opentext Flipper Path Traversal Flaw

CVE-2025-8051 Overview

CVE-2025-8051 is an absolute path traversal vulnerability in OpenText Flipper version 3.1.2. The flaw allows a remote user to supply crafted path input that escapes the intended directory scope. Successful exploitation grants access to files hosted on the server that should not be reachable through the application. The issue is categorized under CWE-35: Path Traversal: '.../...//' and carries a network attack vector requiring user interaction.

Critical Impact
Remote users can read arbitrary files hosted on the server running Flipper 3.1.2, exposing configuration data, source files, and other sensitive content.

Affected Products

OpenText Flipper 3.1.2

Discovery Timeline

2025-10-20 - CVE-2025-8051 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8051

Vulnerability Analysis

OpenText Flipper 3.1.2 fails to properly sanitize file path input supplied through user-controlled parameters. The application accepts absolute paths and traversal sequences that resolve outside the intended web-accessible directory. An attacker interacting with the application can request files stored elsewhere on the host file system.

The vulnerability affects confidentiality, integrity, and availability at a limited scope, since accessed files are read from the process context of the Flipper service. Exploitation requires network reachability to the application and some user interaction, as reflected in the CVSS 4.0 vector. No authentication is required to attempt exploitation.

Root Cause

The root cause is missing or insufficient validation of file path parameters before they are passed to file-read operations. The application does not enforce a canonical base directory or reject absolute paths and directory traversal tokens. Attackers can therefore supply values such as /etc/passwd or paths containing .. sequences to reach files outside the intended document root.

Attack Vector

An attacker sends a crafted HTTP request to the Flipper application with a file path parameter that references an absolute location on the server file system. Because the parameter is not validated against an allowlist or normalized to a safe base directory, the server returns the requested file contents. The attack requires no credentials but does require user interaction as described in the vendor scoring. Refer to the OpenText Security Article for vendor-specific technical detail.

Detection Methods for CVE-2025-8051

Indicators of Compromise

HTTP requests to the Flipper application containing ../, ..\, or URL-encoded traversal sequences such as %2e%2e%2f in query parameters or path segments.
Requests referencing absolute file system paths such as /etc/passwd, /proc/self/environ, or C:\Windows\ in file-related parameters.
Web server access logs showing unexpected 200 responses for requests targeting sensitive system files.

Detection Strategies

Deploy web application firewall (WAF) rules that identify path traversal patterns in requests destined for Flipper endpoints.
Correlate application access logs with file system audit events to identify reads of sensitive files initiated by the Flipper service account.
Baseline normal Flipper file-access behavior and alert on deviations such as reads outside the application's document root.

Monitoring Recommendations

Enable verbose HTTP request logging on the Flipper host and forward logs to a centralized analytics platform for pattern matching.
Monitor the Flipper service account for reads of operating system, credential, or configuration files that fall outside expected paths.
Track outbound data volumes from the Flipper host to identify bulk exfiltration following file disclosure.

How to Mitigate CVE-2025-8051

Immediate Actions Required

Identify all instances of OpenText Flipper 3.1.2 within the environment and inventory their network exposure.
Restrict inbound access to the Flipper application to trusted networks or authenticated users through network segmentation.
Apply vendor guidance from the OpenText Security Article as soon as it is available for your deployment.

Patch Information

OpenText has published guidance for this issue in knowledge base article KB0850527. Administrators should consult the OpenText Security Article to obtain the fixed version and follow vendor upgrade instructions for Flipper 3.1.2 deployments.

Workarounds

Place Flipper behind a reverse proxy or WAF configured to block path traversal sequences and absolute path input in file-related parameters.
Run the Flipper service under a low-privilege account with a restricted file system view, such as a chroot jail or container with a minimal mount set.
Remove sensitive files from directories readable by the Flipper service account until the vendor patch is applied.

bash

# Example WAF rule (ModSecurity) to block traversal patterns
SecRule REQUEST_URI|ARGS "@rx (\.\./|\.\.\\|%2e%2e%2f|%2e%2e/|^/etc/|^/proc/|^[A-Za-z]:\\)" \
    "id:1008051,phase:2,deny,status:403,msg:'CVE-2025-8051 path traversal attempt against Flipper'"