CVE-2025-8048: Opentext Flipper Path Traversal Vulnerability

CVE-2025-8048 Overview

CVE-2025-8048 is a path traversal vulnerability in OpenText Flipper version 3.1.2. The flaw stems from external control of a file name or path [CWE-73], allowing a user to submit a stored local file path and later retrieve the file by requesting the associated document ID. Attackers can leverage this weakness to read files outside the intended document storage boundary, exposing configuration files, credentials, and other sensitive data hosted on the server.

Critical Impact
An authenticated or interacting user can store an arbitrary local file path and download the referenced file, potentially disclosing sensitive system content from the Flipper host.

Affected Products

OpenText Flipper 3.1.2
Deployments exposing the Flipper document submission and retrieval endpoints
Environments where Flipper runs with elevated file-system read privileges

Discovery Timeline

2025-10-20 - CVE-2025-8048 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8048

Vulnerability Analysis

The vulnerability resides in how OpenText Flipper handles file paths supplied during document submission. Instead of restricting inputs to a controlled storage location, the application accepts an externally supplied local file path and associates it with a document ID. When a user requests the document by ID, Flipper reads and returns the file from the stored path. Attackers can register paths that reference operating system files, application configuration, or other data outside the intended document repository. The issue is classified as External Control of File Name or Path [CWE-73], a common precursor to path traversal and information disclosure.

Root Cause

The root cause is missing validation and normalization of user-supplied file path input. Flipper trusts the submitted path as the authoritative source of the document location. There is no enforced allowlist, no canonicalization to detect traversal sequences, and no chroot-style restriction to a document directory. As a result, absolute paths and relative traversal patterns both map directly to the underlying file system read operation.

Attack Vector

Exploitation occurs over the network and requires some form of user interaction to submit the document reference and later request it by ID. An attacker submits a crafted path pointing at a target file, records the returned document ID, and then issues a retrieval request against that ID. The server responds with the contents of the referenced file. No memory corruption or code execution primitive is required. The impact is limited to reading files the Flipper process can access, but that scope frequently includes application secrets and connection strings.

No public proof-of-concept exploit or Exploit-DB entry is available for CVE-2025-8048 at the time of writing. Refer to the OpenText Security Article KB0850531 for vendor-supplied technical detail.

Detection Methods for CVE-2025-8048

Indicators of Compromise

Flipper document submission requests containing absolute file paths such as /etc/passwd, C:\Windows\win.ini, or paths outside the configured document directory
Document retrieval responses whose content type or size does not match expected user-uploaded documents
Repeated document ID enumeration requests from a single source in a short time window
Application log entries showing file reads from directories outside the Flipper storage root

Detection Strategies

Inspect HTTP request bodies to Flipper submission endpoints for path traversal sequences such as ..\, ../, or absolute paths, and alert on matches
Correlate document submission events with subsequent retrieval events that return sensitive file paths or unusual file extensions
Baseline the Flipper process file-read behavior and alert when it accesses paths outside its designated document directory

Monitoring Recommendations

Enable verbose application and web server logging on Flipper 3.1.2 hosts and forward logs to a centralized analytics platform
Monitor for outbound transfers of large or sensitive files originating from the Flipper server process
Track authentication and session activity on Flipper to identify unusual accounts submitting document references

How to Mitigate CVE-2025-8048

Immediate Actions Required

Restrict network exposure of OpenText Flipper 3.1.2 to trusted internal users and remove any public-facing access
Review Flipper submission and retrieval logs for prior abuse of externally supplied paths
Reduce the file-system privileges of the account running the Flipper service to the minimum required for document storage
Apply vendor guidance from the OpenText Security Article KB0850531 as soon as it is available for your deployment

Patch Information

OpenText has published advisory KB0850531 addressing CVE-2025-8048. Administrators running Flipper 3.1.2 should consult the OpenText Security Article for the fixed version and upgrade instructions, and plan an upgrade window as soon as feasible. The EPSS score for this CVE is 0.268% as of 2026-07-28, indicating low near-term exploitation probability, but the file disclosure impact justifies prompt remediation.

Workarounds

Place Flipper behind a reverse proxy or web application firewall configured to block path traversal patterns and absolute path submissions
Enforce operating system level access controls so the Flipper service account cannot read files outside its document storage directory
Where possible, mount the Flipper document directory on a dedicated volume and use file-system permissions to deny access to sensitive directories

bash

# Example: restrict the Flipper service account file-system view on Linux
# Run Flipper under a dedicated user and grant read access only to its document root
sudo useradd -r -s /usr/sbin/nologin flipper
sudo chown -R flipper:flipper /var/lib/flipper/documents
sudo chmod 750 /var/lib/flipper/documents

# Example nginx rule to reject obvious path traversal in submitted parameters
location /flipper/ {
    if ($request_uri ~* "(\.\./|\.\.\\|%2e%2e%2f|/etc/|c:\\)") {
        return 403;
    }
    proxy_pass http://flipper_backend;
}