CVE-2026-42016: JFrog Artifactory Privilege Escalation Flaw

CVE-2026-42016 Overview

CVE-2026-42016 is a privilege escalation vulnerability affecting JFrog Artifactory Self Hosted versions before 7.133.11. The flaw resides in the token validation logic, which verifies the token signature and issuer but fails to validate the token's scope. Authenticated attackers can exploit this weakness to escalate privileges within an Artifactory deployment. The vulnerability maps to CWE-863: Incorrect Authorization and impacts the confidentiality, integrity, and availability of hosted artifacts.

Critical Impact
An authenticated attacker with low privileges can escalate to administrative access, compromising stored artifacts, build pipelines, and downstream software supply chains.

Affected Products

JFrog Artifactory Self Hosted, all versions prior to 7.133.11
Deployments relying on scoped access tokens for authorization
Self-managed Artifactory instances exposed to authenticated users

Discovery Timeline

2026-07-27 - CVE-2026-42016 published to NVD
2026-07-30 - Last updated in NVD database

Technical Details for CVE-2026-42016

Vulnerability Analysis

The vulnerability stems from incomplete token verification within JFrog Artifactory. Artifactory issues access tokens containing a signature, an issuer field, and a scope that defines permitted actions and resources. The affected versions validate the token signature and issuer but omit enforcement of the scope claim during authorization decisions.

An attacker who obtains any valid low-privilege token can present it against endpoints that should require higher scopes. The server accepts the token because the cryptographic checks succeed. This grants the attacker access to APIs and repositories beyond their assigned permissions.

Exploitation requires network access to the Artifactory instance and valid credentials or a valid token. No user interaction is required, and the attack complexity is low.

Root Cause

The root cause is an authorization logic gap categorized under CWE-863. Artifactory's token verification routine treats a well-formed, correctly signed token as sufficient proof of authorization. The scope claim, which restricts a token to specific repositories, actions, or administrative functions, is not compared against the requested operation. This design flaw enables horizontal and vertical privilege escalation across the platform.

Attack Vector

An attacker authenticates to Artifactory or obtains a token from a compromised low-privilege account. The attacker then issues API requests to protected endpoints such as repository configuration, user management, or system administration. Because the server validates only the signature and issuer, requests succeed regardless of the token's declared scope. The attacker can create administrative users, modify repository contents, poison build artifacts, or exfiltrate stored packages.

Refer to the JFrog Security Advisory Document for vendor-supplied technical detail.

Detection Methods for CVE-2026-42016

Indicators of Compromise

Unexpected administrative API calls originating from accounts with limited assigned roles
Creation of new admin users, permission targets, or access tokens outside standard change windows
Repository configuration changes, artifact overwrites, or new remote repositories added without corresponding tickets
Access token usage patterns that span scopes broader than the token's original grant

Detection Strategies

Correlate Artifactory access logs (access.log, request.log) against the issued token scope registry to identify scope mismatches
Alert on privileged endpoint access (/api/security/*, /api/system/*) from tokens issued to non-admin principals
Baseline normal API usage per token and flag deviations in endpoint diversity or request volume

Monitoring Recommendations

Forward Artifactory audit and access logs to a centralized SIEM for correlation with authentication events
Enable JFrog's built-in audit logging and retain logs for at least 90 days for forensic review
Monitor for unauthorized changes to permission targets, groups, and admin role assignments

How to Mitigate CVE-2026-42016

Immediate Actions Required

Upgrade JFrog Artifactory Self Hosted to version 7.133.11 or later without delay
Revoke and reissue all existing access tokens to invalidate any tokens that may have been abused
Audit administrative accounts, permission targets, and repository configurations for unauthorized changes
Restrict network exposure of Artifactory management endpoints to trusted administrative networks

Patch Information

JFrog has released a fix in Artifactory Self Hosted 7.133.11. Consult the JFrog Artifactory Release Notes for upgrade procedures and the JFrog Security Advisory Document for full patch details.

Workarounds

Rotate all long-lived access tokens and issue short-lived tokens with narrow scopes until patching completes
Enforce network-level segmentation so that only authorized clients can reach the Artifactory API surface
Disable or restrict token generation for non-administrative users where operational needs permit

bash

# Verify installed Artifactory version and plan upgrade to 7.133.11 or later
curl -u <admin_user>:<password> \
  https://<artifactory-host>/artifactory/api/system/version

# Revoke a specific access token after upgrade
curl -X DELETE -u <admin_user>:<password> \
  https://<artifactory-host>/artifactory/api/security/token/revoke \
  -d "token=<token_value>"