CVE-2026-48328: Adobe ColdFusion Auth Bypass Vulnerability

CVE-2026-48328 Overview

Adobe ColdFusion contains an improper input validation flaw that enables a security feature bypass across Adobe ColdFusion 2023 and 2025 releases. A low-privileged, network-based attacker can exploit the weakness to bypass built-in security controls and obtain unauthorized read access to data outside the vulnerable component's scope. Exploitation requires no user interaction, and the vulnerability produces a scope change, meaning the attacker impacts resources beyond the initially affected process. Adobe published the fix in security advisory APSB26-82. The issue is tracked as [CWE-20: Improper Input Validation].

Critical Impact
A low-privileged remote attacker can bypass ColdFusion security controls to read data outside the component's authorization scope without any user interaction.

Affected Products

Adobe ColdFusion 2023 (base release through Update 21)
Adobe ColdFusion 2025 (base release through Update 10)
Deployments using default ColdFusion security configurations across supported platforms

Discovery Timeline

2026-07-14 - CVE-2026-48328 published to NVD
2026-07-15 - Last updated in NVD database

Technical Details for CVE-2026-48328

Vulnerability Analysis

The vulnerability lives in ColdFusion input handling paths that enforce security decisions on request-supplied data. ColdFusion fails to fully validate specific inputs before applying an authorization or filtering control. An authenticated attacker with low privileges can craft requests that pass ColdFusion's checks yet reference resources the account should not read.

Because the flaw produces a scope change, the impact crosses trust boundaries. Data belonging to other tenants, application contexts, or server-side components becomes readable through the bypassed control. Integrity and availability remain intact, which aligns with the confidentiality-only impact classification.

The combination of network reach, low complexity, and no user interaction makes the issue attractive for opportunistic scanning once technical details become public. Public exploit code and CISA KEV listing are not present at the time of publication.

Root Cause

The root cause is improper input validation [CWE-20] in a ColdFusion request-processing routine that governs a security feature. The routine accepts values it should reject or normalize, and it uses those values in a subsequent authorization decision. Attackers submit inputs that satisfy the flawed check while dereferencing protected content.

Attack Vector

Exploitation occurs over the network against an exposed ColdFusion application. The attacker authenticates with any low-privileged account, then issues a crafted HTTP request to a vulnerable endpoint. The malformed input evades the security feature, and the server returns data the account is not authorized to view. See the Adobe ColdFusion Security Advisory APSB26-82 for vendor-provided technical context.

Detection Methods for CVE-2026-48328

Indicators of Compromise

Unexpected HTTP requests from low-privileged authenticated sessions targeting administrative or restricted ColdFusion endpoints
ColdFusion application logs showing successful responses to requests containing unusual parameter encoding, path segments, or type coercion payloads
Access patterns where a single authenticated account reads resources belonging to multiple tenants or application scopes in a short window

Detection Strategies

Compare authenticated request patterns against baseline user behavior to flag scope-crossing reads from low-privileged accounts
Inspect ColdFusion access and error logs for repeated 4xx responses followed by successful 200 responses to the same endpoint with mutated parameters
Correlate web server, ColdFusion, and downstream data-store logs to identify reads that bypass the expected authorization path

Monitoring Recommendations

Forward ColdFusion, IIS or Apache, and reverse proxy logs to a centralized analytics platform for correlation and retention
Alert on any low-privileged account accessing endpoints historically reserved for administrators or service accounts
Track outbound data volume per authenticated session and alert on statistical anomalies indicative of bulk read abuse

How to Mitigate CVE-2026-48328

Immediate Actions Required

Apply the Adobe security updates referenced in APSB26-82 to all ColdFusion 2023 and 2025 servers
Inventory internet-exposed ColdFusion instances and prioritize patching for those reachable from untrusted networks
Rotate credentials for low-privileged ColdFusion accounts after patching if abnormal access is observed in logs

Patch Information

Adobe released fixed builds for ColdFusion 2023 and ColdFusion 2025 in security bulletin APSB26-82. Administrators should install the latest cumulative update for their release train and restart the ColdFusion service. Verify the deployed build number against the versions listed in the advisory before returning the server to production.

Workarounds

Restrict network access to ColdFusion administrative and application endpoints using a web application firewall or network ACLs until patching completes
Enforce ColdFusion's lockdown guide recommendations, including running the service under a least-privilege account and disabling unused components
Require multi-factor authentication and short session lifetimes for all ColdFusion user accounts to raise the cost of low-privileged access abuse

bash

# Configuration example: block access to sensitive ColdFusion paths
# from untrusted sources at the reverse proxy (nginx)
location ~* ^/(CFIDE/administrator|cfide/adminapi|CFIDE/scripts) {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://coldfusion_backend;
}