CVE-2026-97179: O2OA Information Disclosure Vulnerability

CVE-2026-97179 Overview

CVE-2026-97179 is an information disclosure vulnerability affecting O2OA versions up to 9.5.3 and 10.0.2. The flaw resides in the list function of o2server/x_base_core_project/src/main/java/com/x/base/core/project/connection/CipherConnectionAction.java, part of the Cipher Connection Handler component. Attackers can manipulate the fileUrl argument to disclose sensitive information remotely. The exploit has been published, and the vendor did not respond to disclosure attempts. The weakness is classified as [CWE-200] Exposure of Sensitive Information to an Unauthorized Actor.

Critical Impact
Remote authenticated attackers can retrieve sensitive file contents by abusing the fileUrl parameter in the Cipher Connection Handler, with public exploit code already available.

Affected Products

O2OA versions up to 9.5.3
O2OA versions up to 10.0.2
Component: Cipher Connection Handler (CipherConnectionAction.java)

Discovery Timeline

2026-09-24 - CVE CVE-2026-97179 published to NVD
2026-09-24 - Last updated in NVD database

Technical Details for CVE-2026-97179

Vulnerability Analysis

The vulnerability resides in the list function implemented inside CipherConnectionAction.java within the O2OA server codebase. This class handles cipher-authenticated HTTP connections used for internal file and resource access. The fileUrl argument accepted by the function is not adequately validated before being used to fetch content, allowing an attacker to coerce the handler into returning data it should not expose.

Because the handler executes with the trust context of the application server, attacker-supplied URLs can be used to reach resources beyond the caller's intended scope. The result is unauthorized disclosure of file contents or internal resource data. Public references, including the GitHub Issue Discussion and VulDB Vulnerability Details, document the issue.

Root Cause

The root cause is improper validation of the fileUrl parameter passed to the Cipher Connection Handler. The function treats the supplied URL as trusted input and returns the referenced content without enforcing access controls on the target resource. This matches the [CWE-200] weakness pattern of exposing sensitive information to actors outside the intended authorization boundary.

Attack Vector

The attack is remote and requires low privileges. An authenticated user with network access to the O2OA server submits a crafted request to the vulnerable endpoint, supplying a fileUrl value that points to a sensitive internal resource. The server processes the request through the Cipher Connection Handler and returns the referenced content to the attacker. No user interaction is required, and the exploit has been publicly disclosed. The EPSS score is 0.334% as of 2026-10-01.

See the VulDB CTI Analysis for additional exploitation context.

Detection Methods for CVE-2026-97179

Indicators of Compromise

HTTP requests to O2OA endpoints that invoke the Cipher Connection Handler with unusual or externally referenced fileUrl parameter values.
Access log entries showing repeated requests varying the fileUrl argument, indicating enumeration of internal resources.
Outbound connections initiated by the O2OA server process to unexpected internal hosts following crafted inbound requests.

Detection Strategies

Inspect application and web server logs for requests referencing CipherConnectionAction or the list function with attacker-controlled fileUrl values.
Baseline normal fileUrl parameter patterns and alert on requests referencing file paths, internal hostnames, or scheme variations outside that baseline.
Correlate authenticated session activity with abnormal volumes of file retrieval requests from a single account.

Monitoring Recommendations

Enable verbose request logging on the O2OA server, capturing full query parameters for endpoints exposing the Cipher Connection Handler.
Forward O2OA application logs to a centralized SIEM or data lake to support historical hunting and parameter-value analysis.
Monitor egress traffic from the application server for unexpected destinations that may indicate URL-based abuse of the handler.

How to Mitigate CVE-2026-97179

Immediate Actions Required

Restrict network exposure of the O2OA management interface to trusted administrative networks only.
Audit accounts with access to O2OA and remove unnecessary low-privilege users who could reach the vulnerable endpoint.
Review historical access logs for prior exploitation attempts referencing CipherConnectionAction or anomalous fileUrl values.

Patch Information

The vendor was contacted prior to public disclosure but did not respond, and no official patch is referenced in the available advisories. Monitor the O2OA project repository and the VulDB CVE Report for an upstream fix. Until a vendor patch is released, apply compensating controls to limit exposure.

Workarounds

Place O2OA behind a reverse proxy or web application firewall and block requests that supply fileUrl values referencing unexpected schemes, hostnames, or path patterns.
Enforce strict authentication and least-privilege authorization on all O2OA endpoints that invoke the Cipher Connection Handler.
If the list function is not required for business operations, disable or remove the endpoint route to eliminate the attack surface.

bash

# Example WAF rule concept: block suspicious fileUrl parameters
# targeting the Cipher Connection Handler endpoint
SecRule ARGS:fileUrl "@rx (file://|\.\./|127\.0\.0\.1|localhost|internal)" \
    "id:1097179,phase:2,deny,status:403,\
     msg:'CVE-2026-97179 O2OA CipherConnectionAction fileUrl abuse'"