CVE-2025-8716: Content Management Cache Poisoning Vulnerability

CVE-2025-8716 Overview

CVE-2025-8716 affects OpenText Content Management versions 20.4 through 25.3. Authenticated attackers can exploit a cache poisoning technique to download unprotected files from the server when filenames are known. The flaw is classified under [CWE-754] as improper check for unusual or exceptional conditions. Exploitation requires valid credentials, network access, and user interaction, which raises the attack complexity. Successful exploitation exposes file contents stored on the server, resulting in an information disclosure impact.

Critical Impact
Authenticated attackers can retrieve unprotected server-side files by poisoning the cache and referencing known filenames, exposing confidential content.

Affected Products

OpenText Content Management version 20.4
OpenText Content Management versions 21.x through 24.x
OpenText Content Management version 25.3

Discovery Timeline

2025-09-11 - CVE-2025-8716 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8716

Vulnerability Analysis

The vulnerability resides in the cache handling logic of OpenText Content Management. An authenticated attacker manipulates cache entries so that requests for known filenames return file content that should otherwise be access-controlled. The weakness is categorized as [CWE-754], an improper check for unusual or exceptional conditions in the caching flow. The attacker must know or guess valid filenames stored on the server, which limits opportunistic exploitation. Because the technique bypasses object-level access checks through the cache layer, standard authorization on individual files does not prevent retrieval. The Exploit Prediction Scoring System places this vulnerability in the lower probability range for near-term exploitation, but authenticated access to enterprise content platforms makes it a viable insider or post-compromise vector.

Root Cause

The root cause is an incomplete verification step in the cache subsystem. The server serves cached responses without re-validating that the requesting session is authorized for the underlying file. This missing exception check permits a crafted sequence of requests to poison cache state.

Attack Vector

The attack originates over the network against an authenticated session. The attacker executes a multi-step request pattern that requires user interaction and elevated request timing to succeed. Once the cache is poisoned, subsequent requests for target filenames return the file bodies. See the OpenText Knowledge Base Article for vendor technical details.

No verified public proof-of-concept code is available. The vulnerability mechanism is described here in prose; no synthetic exploit is provided.

Detection Methods for CVE-2025-8716

Indicators of Compromise

Repeated authenticated requests to Content Management endpoints for filenames that a user has no assigned permissions to access.
Unusual sequences of cache-related requests that vary only in headers or query parameters against the same resource path.
Successful file downloads returned from cache responses without a preceding authorization event in application logs.

Detection Strategies

Correlate application-layer access logs with authorization decisions to identify file retrievals that lack a matching permission check.
Baseline per-user file access patterns and alert on sudden enumeration of filenames across content repositories.
Inspect reverse proxy or CDN logs for cache HIT responses on protected paths served to low-privilege sessions.

Monitoring Recommendations

Forward OpenText Content Management access and audit logs to a centralized analytics platform for cross-user correlation.
Track cache hit ratios and origin bypass anomalies on endpoints that serve document downloads.
Alert on authenticated accounts accessing document volumes outside their normal role scope.

How to Mitigate CVE-2025-8716

Immediate Actions Required

Inventory all OpenText Content Management deployments and identify instances running versions 20.4 through 25.3.
Apply the vendor-provided fix referenced in the OpenText Knowledge Base as soon as it is available in your maintenance channel.
Review authentication logs for suspicious authenticated sessions and rotate credentials for accounts showing anomalous file access.

Patch Information

OpenText has published guidance in KB0847046. Administrators should consult the article for the specific fixed versions and upgrade paths applicable to their deployment. Apply the upgrade in a staged environment before rolling to production.

Workarounds

Restrict access to Content Management to trusted networks using VPN or IP allow-listing while a patch is being deployed.
Reduce or disable response caching on endpoints that serve authenticated file downloads until the fix is applied.
Enforce least-privilege on Content Management accounts to limit the scope of files an authenticated attacker could enumerate.

bash

# Configuration example: restrict cache on authenticated download endpoints
# Refer to the vendor advisory for supported configuration parameters
# Example reverse-proxy directive to bypass cache for authenticated content paths
location /content/download/ {
    proxy_no_cache 1;
    proxy_cache_bypass 1;
    proxy_pass http://opentext_backend;
}