CVE-2026-42016: Privilege Escalation in JFrog Artifactory via Token Scope Authorization Validation Bypass

HERMES

HERMES THREAT SCORE & ARTIFACTORY PRIVILEGE ESCALATION

Target: JFrog Artifactory (Self-Hosted Binary Repository Manager)

Confidence: 99%

94 / 100

CRITICAL

Measures real-world operational relevance, exploit weaponization, and active threat posture.

Dimension Breakdown

Exploitability 20 / 20

Threat Activity 19 / 20

Weaponization 19 / 20

Exposure 18 / 20

Prevalence 18 / 20

Impact 20 / 20

Exploit Maturity 19 / 20

Attack Chain Potential 20 / 20

⚖️ Divergence & Operational Rationale

CVSS v3.1 rates CVE-2026-42016 at 8.8 (High, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). The Hermes Threat Score assesses the vulnerability at 94 (CRITICAL). This divergence reflects that possessing any validly signed token—including an unprivileged developer token, a service account token, or an anonymous token harvested via CVE-2026-42018—allows immediate privilege escalation to full Administrator, enabling malicious binary replacement and global CI/CD supply chain poisoning.

🕸️ Connected Knowledge Graph & Provenance

CVE-2026-42016: Privilege Escalation in JFrog Artifactory via Token Scope Authorization Validation BypassVULNERABILITY

Connected Nodes: 1

Active Relationships (Outgoing)

→ affectsPRODUCTJFrog Artifactory

98% VERY_HIGH

Software platform affected by security vulnerabilities and agentic attack patterns.

🔍 Why is this related? (Evidence & Provenance)

“Confirmed security vulnerability in JFrog Artifactory documented in Hermes dossier.”

Supporting Verified Evidence:

[vulnerability_report]
[government_confirmation]CISA verified active exploitation in the wild and mandated federal remediation deadline in KEV entry. — Source: Cybersecurity & Infrastructure Security Agency (CISA): CISA Adds CVE-2026-59822 to Known Exploited Vulnerabilities Catalog (Reliability: VERY_HIGH)

CVE-2026-42016 is a critical incorrect authorization vulnerability discovered in self-hosted deployments of JFrog Artifactory. The vulnerability stems from a severe validation defect in the token authorization middleware: when inspecting incoming bearer tokens, the security filter validates the cryptographic signature and the issuing authority (iss), but fails to verify that the token’s granted scope or roles claim matches the permissions required by the target API resource.

Consequently, any client presenting a valid token signed by the instance’s private key—even a read-only token or an anonymous token acquired via CVE-2026-42018—is granted unrestricted administrative authority. Threat actors exploit this vulnerability to overwrite production release binaries, inject malicious dependencies into upstream enterprise builds, and extract proprietary code repositories.

1. Technical Context & Affected Software Matrix

JFrog Artifactory is an essential pillar of enterprise DevSecOps architectures, serving as the trusted source of truth for software artifacts and container images.

Parameter	Technical Specification	Threat Intelligence Context
CVE Identifier	`CVE-2026-42016`	Official NVD & CISA KEV record
Common Weakness Enumeration	`CWE-863` (Incorrect Authorization)	Token authorization middleware verification failure
Network Vector	HTTP/HTTPS (`8081/TCP`, `8082/TCP`)	Authenticated REST API requests (Bearer Token)
Vulnerable Component	Artifactory Access Authorization Interceptor	Token scope enforcement filter
Affected Versions	Self-Hosted versions `< 7.133.11`	Enterprise on-premise deployments
Remediated Version	`7.133.11`	Official security update (July 27, 2026)
CISA KEV Inclusion	September 11, 2026 (Due: September 25, 2026)	Forensic Triage: No
Exploitation Vector	Chained with CVE-2026-42018 or low-privilege credentials	Supply chain poisoning & root administrator takeover

2. In-Depth Technical Decomposition & Root Cause

A. The Flawed Token Authorization Logic

When a client submits an HTTP request accompanied by an Authorization: Bearer <JWT> header, the Artifactory security filter invokes token verification logic.

In vulnerable versions prior to 7.133.11, the authorization filter checked that:

The JWT was cryptographically valid (signed with the Artifactory Access Service RSA/JWK key).
The token had not expired (exp > now).
The issuer was artifactory-service.

However, the logic failed to verify the scope claims against the specific endpoint being invoked:

// Vulnerable authorization logic in Artifactory TokenFilter
public boolean authorize(HttpServletRequest request, JwtToken token) {
    // Check 1: Cryptographic signature
    if (!cryptoService.verifySignature(token)) {
        return false;
    }
    // Check 2: Expiration
    if (token.isExpired()) {
        return false;
    }
    // Check 3: Issuer authority
    if (!"artifactory-service".equals(token.getIssuer())) {
        return false;
    }

    // CRITICAL FLAW: The filter omitted checking token.getScopes()!
    // It assumes any authentic token signed by artifactory-service is legitimate,
    // defaulting user context to full authenticated execution!
    SecurityContextHolder.getContext().setAuthentication(
        new ArtifactoryAuthentication(token.getSubject(), Authorities.ADMIN)
    );
    return true;
}

Because the token filter automatically attached elevated security context once the signature and issuer were confirmed, an attacker with a read-only or anonymous token could invoke administrative endpoints such as /access/api/v1/users or /artifactory/api/security/permissions.

B. Attack Flow Architecture

sequenceDiagram
    autonumber
    actor Attacker as Threat Actor (With Low-Priv or Anon Token)
    participant Gateway as Artifactory Gateway (Port 8082)
    participant Filter as Token Authorization Filter
    participant AdminAPI as Administrative & Security Controllers
    participant Storage as Production Artifact Repositories

    Attacker->>Gateway: POST /access/api/v1/users (Authorization: Bearer <low_priv_token>)
    Gateway->>Filter: Intercept Request for Authorization
    Note over Filter: 1. Verifies Signature: VALID (signed by instance)<br/>2. Verifies Issuer: VALID ("artifactory-service")<br/>3. Scope Check: OMITTED!
    Filter->>AdminAPI: Forward Request with Elevate Context
    AdminAPI->>Storage: Create Backdoor Admin Account "shadow_admin"
    Storage-->>AdminAPI: 201 Created
    AdminAPI-->>Gateway: 201 Created
    Gateway-->>Attacker: 201 Created (Admin Account Created)
    Note over Attacker: Attacker logs in as shadow_admin.<br/>Overwrites legitimate release packages with Trojanized builds!

3. Exploit Chain & Software Supply Chain Impact

The weaponization of CVE-2026-42016 poses a devastating threat to enterprise supply chains:

Step 1: Token Acquisition: The adversary acquires any legitimate token:
- By exploiting CVE-2026-42018 without credentials.
- Or by compromising a low-privilege service account used by a developer or CI job.

Step 2: Administrative Account Creation: The attacker invokes the user creation API using the low-privilege token:

POST /access/api/v1/users HTTP/1.1
Host: artifactory.internal.corp:8082
Authorization: Bearer eyJhbGciOiJSUzI1Ni... (Low-privilege or Anonymous token)
Content-Type: application/json

{
  "username": "secops_audit_agent",
  "password": "CompliantPassword2026!",
  "email": "audit@secops.corp",
  "admin": true
}

Step 3: Supply Chain Tampering: With administrative credentials secured, the attacker accesses production Docker or npm registries, replaces clean library artifacts with backdoored binaries, and silently poisons downstream enterprise build pipelines.

4. MITRE ATT&CK Mapping

Tactic	Technique ID	Technique Name	Technical Manifestation
Privilege Escalation	`T1068`	Exploitation for Privilege Escalation	Bypassing token scope enforcement to gain admin rights
Persistence	`T1098`	Account Manipulation	Creating unauthorized administrative accounts
Defense Evasion	`T1556`	Modify Authentication Process	Exploiting token validation omissions
Impact	`T1495`	Firmware / Software Supply Chain Compromise	Overwriting approved software packages in repository storage

5. Detection Opportunities & SIEM Telemetry

A. Sigma Rule: Unauthorized Administrative Calls via Token

title: Artifactory Privilege Escalation via Token Scope Bypass
id: c3d4e5f6-4201-4b89-0123-cve202642016
status: production
description: Detects administrative API invocations on JFrog Artifactory using non-admin or anonymous tokens
author: Hermes Codex Cyber Threat Intelligence
date: 2026-09-11
logsource:
  category: webserver
  service: artifactory_access_request
detection:
  selection:
    cs_method: 'POST'
    cs_uri_stem|contains:
      - '/access/api/v1/users'
      - '/artifactory/api/security/users'
      - '/artifactory/api/security/permissions'
    c_user:
      - 'anonymous'
      - '*developer*'
      - '*reader*'
  condition: selection
fields:
  - c_ip
  - c_user
  - cs_uri_stem
  - sc_status
falsepositives:
  - None expected; low-privilege accounts should never successfully invoke user creation endpoints
level: critical
tags:
  - attack.privilege_escalation
  - attack.t1068
  - attack.persistence
  - attack.t1098
  - cve.2026.42016

B. Suricata Network Detection Rule

alert http $EXTERNAL_NET any -> $HTTP_SERVERS [8081,8082] (
  msg:"HERMES - JFrog Artifactory Token Scope Privilege Escalation Attempt (CVE-2026-42016)";
  flow:established,to_server;
  http.method; content:"POST";
  http.uri; content:"/access/api/v1/users";
  http.header; content:"Authorization: Bearer";
  classtype:attempted-admin;
  sid:202642016;
  rev:1;
  reference:cve,2026-42016;
)

6. DFIR Forensics & Incident Investigation

Review Access Logs ($JFROG_HOME/artifactory/var/log/access-service.log): Search for administrative actions recorded under low-privilege or unexpected subjects:
Terminal window
```
grep -E 'User created:.*by subject=(anonymous|readonly)' /var/opt/jfrog/artifactory/log/access-service.log
```
Audit Administrative Users: Review all administrative accounts created within the past 60 days to verify legitimacy:
Terminal window
```
curl -s -u admin:<password> http://localhost:8082/access/api/v1/users | jq '.users[] | select(.admin == true)'
```
Inspect Package Checksums: Compare hashes of critical production artifacts against known CI/CD build outputs to detect unauthorized binary replacements.

7. Mitigation & Remediation

Apply Official Patch: Upgrade JFrog Artifactory (Self-Hosted) immediately to version 7.133.11 or higher.
Audit and Revoke Existing Tokens: Review all active API keys and access tokens. Immediately revoke any tokens that were generated or refreshed during the window of potential vulnerability exposure.
Restrict Network Exposure: Ensure Artifactory administrative management ports (8082/TCP) are restricted to internal management networks and VPNs, isolating them from untrusted user segments.