CVE-2026-66377: Authentication Bypass Vulnerability

CVE-2026-66377 Overview

CVE-2026-66377 is a missing authorization vulnerability [CWE-862] that allows an unauthenticated user to access restricted repository information under specific conditions. The advisory maps to JFrog product documentation, indicating the flaw affects a JFrog repository management component. Because the attack vector is network-based and requires no authentication or user interaction, exposed instances can leak repository metadata to remote actors. Impact is limited to confidentiality; integrity and availability remain unaffected.

Critical Impact
Remote unauthenticated attackers can retrieve restricted repository information under specific conditions, exposing metadata that supports reconnaissance for follow-on supply chain or credential attacks.

Affected Products

JFrog Artifactory Self-Managed (per vendor advisory documentation)
Refer to the JFrog Security Advisories for the specific affected release list
Refer to the JFrog Release Documentation for fixed versions

Discovery Timeline

2026-08-12 - CVE-2026-66377 published to NVD
2026-08-12 - Last updated in NVD database

Technical Details for CVE-2026-66377

Vulnerability Analysis

The vulnerability is a missing authorization defect. An affected endpoint returns restricted repository information without verifying that the requester possesses the required permissions. Because the flaw is exposed over the network and does not require credentials or user interaction, an attacker only needs to reach the service and issue a request that meets the specific conditions described by the vendor.

Exposure is bounded to information disclosure. The vulnerability does not permit modification of repository content or disruption of service. However, disclosed repository metadata often supports downstream attacks. Attackers use such data to enumerate internal package names, identify private artifacts, and prepare dependency confusion or targeted credential attacks against the software supply chain.

Root Cause

The root cause is an authorization check gap [CWE-862]. The application processes a request path that should require authentication and authorization, but the responsible handler fails to enforce those controls under the specific conditions referenced in the advisory. This is a broken access control pattern rather than a memory-safety or input validation defect.

Attack Vector

Exploitation is remote and unauthenticated. An attacker sends a crafted HTTP request to a reachable instance and receives repository information that should be restricted. No client interaction is required. Internet-exposed deployments and instances reachable from lower-trust network segments face the highest risk. The vendor advisory does not indicate public exploit code or evidence of exploitation in the wild.

No verified proof-of-concept code is published. See the JFrog Security Advisories for authoritative technical details.

Detection Methods for CVE-2026-66377

Indicators of Compromise

Unauthenticated HTTP GET requests to repository listing or metadata endpoints returning HTTP 200 responses
Access log entries showing repository information responses without a preceding authentication token or session cookie
Anomalous request patterns from single source IPs enumerating multiple repository paths

Detection Strategies

Review reverse proxy and application access logs for unauthenticated requests that returned repository metadata payloads
Baseline normal authenticated access patterns and alert on repository metadata responses lacking an authorization header
Correlate repository enumeration activity with subsequent artifact download attempts to identify reconnaissance-to-exploitation transitions

Monitoring Recommendations

Forward web server, application, and identity provider logs to a centralized analytics platform for correlation
Enable alerting on repeated unauthenticated 200-status responses against repository APIs
Monitor egress from the repository host for unusual outbound connections following enumeration activity

How to Mitigate CVE-2026-66377

Immediate Actions Required

Consult the JFrog Security Advisories and upgrade to a fixed release as identified for your product edition
Restrict network exposure of repository management interfaces to trusted networks or VPN users only
Audit access logs for prior unauthenticated repository metadata retrieval since the affected version was deployed

Patch Information

JFrog publishes fixed versions through its release documentation. Administrators should review the JFrog Release Documentation and the associated security advisory to identify the specific fixed build for their deployment, then apply the upgrade following the vendor's supported procedure.

Workarounds

Place the repository service behind an authenticating reverse proxy that rejects unauthenticated requests to affected endpoints
Apply network access control lists to limit inbound traffic to known administrator and CI/CD source ranges
Disable anonymous access at the application level where operationally feasible until the patch is applied

bash

# Example: restrict inbound access at the reverse proxy (nginx)
location /artifactory/ {
    allow 10.0.0.0/8;
    allow 192.168.0.0/16;
    deny all;
    proxy_pass http://artifactory_backend;
}