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Hermes Codex

CVE-2026-42018: Anonymous User Token Generation Exposure in JFrog Artifactory

HERMES

HERMES THREAT SCORE & SUPPLY CHAIN AUTHENTICATION EXPOSURE

Target: JFrog Artifactory (Self-Hosted Binary Repository Manager)
Confidence: 98%
89 / 100
HIGH

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

Dimension Breakdown
Exploitability 20 / 20
Threat Activity 18 / 20
Weaponization 18 / 20
Exposure 18 / 20
Prevalence 18 / 20
Impact 16 / 20
Exploit Maturity 18 / 20
Attack Chain Potential 20 / 20
⚖️ Divergence & Operational Rationale

CVSS v3.1 rates CVE-2026-42018 at 7.5 (High, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). The Hermes Threat Score evaluates it at 89 (HIGH). While standalone exploitation yields read-only token leakage, in-the-wild threat activity overwhelmingly chains CVE-2026-42018 with CVE-2026-42016 (Token Scope Validation Bypass) to achieve unauthenticated, full administrative takeover of enterprise software supply chain repositories.

🕸️ Connected Knowledge Graph & Provenance

CVE-2026-42018: Anonymous User Token Generation Exposure in JFrog ArtifactoryVULNERABILITY

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:

1. Technical Context & Affected Software Matrix

Section titled “1. Technical Context & Affected Software Matrix”

JFrog Artifactory serves as the central software supply chain registry for build artifacts, proprietary source libraries, and deployment containers across major software development organizations.

ParameterTechnical SpecificationThreat Intelligence Context
CVE IdentifierCVE-2026-42018Official NVD & CISA KEV record
Common Weakness EnumerationCWE-287 (Improper Authentication)Authentication policy enforcement failure
Network VectorHTTP/HTTPS (8081/TCP, 8082/TCP)Direct unauthenticated REST API requests
Vulnerable ComponentArtifactory Token Generation Service (access-service)Anonymous token dispatch handler
Affected VersionsSelf-Hosted versions < 7.111.20 and < 7.133.11Enterprise on-premise deployments
Remediated Versions7.111.20 and 7.133.11Vendor security advisory releases
CISA KEV InclusionSeptember 11, 2026 (Due: September 25, 2026)Forensic Triage: No
Chained ExploitationRoutinely chained with CVE-2026-42016Unauthenticated supply chain repository takeover

2. In-Depth Technical Decomposition & Root Cause

Section titled “2. In-Depth Technical Decomposition & Root Cause”

A. The Anonymous Token Generation Flaw

Section titled “A. The Anonymous Token Generation Flaw”

In standard Artifactory configurations, disabling the “Allow Anonymous Access” toggle is intended to mandate that every incoming request supply valid user credentials (such as username/password or an API key/access token).

However, within the internal microservice communication pipeline (specifically between the frontend reverse proxy and the backend access-service), an unauthenticated request to certain internal token issuance endpoints (such as /access/api/v1/tokens/create or internal session bootstrapping endpoints) triggered a fallback path. The service assumed that if no credentials were provided, the request should be fulfilled using an ephemeral anonymous context:

// Conceptual representation of the flawed token issuance logic
public TokenResponse issueToken(TokenRequest request) {
    if (request.getCredentials() == null) {
        // FLAW: Fails to verify if global anonymous access is explicitly disabled
        // Generates a validly signed token with subject: "anonymous"
        UserContext anonUser = userManager.getAnonymousUser();
        return tokenService.signToken(anonUser, DefaultScopes.READ_ONLY);
    }
    // Standard authenticated token generation...
}

Because the resulting token is cryptographically signed by the instance’s private key, downstream Artifactory microservices accept it as a legitimate internal access token.

B. Attack Flow Architecture

Section titled “B. Attack Flow Architecture”
sequenceDiagram
    autonumber
    actor Attacker as Unauthenticated Threat Actor
    participant Proxy as Artifactory Gateway (Port 8082)
    participant Access as Access Service (Token Issuer)
    participant Repo as Artifact Repositories


    Note over Proxy: Anonymous Access is DISABLED in Global Config
    Attacker->>Proxy: POST /access/api/v1/tokens/anonymous (No Auth)
    Proxy->>Access: Forward request without credentials
    Note over Access: Flaw in policy check.<br/>Signs JWT for subject "anonymous" via instance private key.
    Access-->>Proxy: Return valid signed JWT Bearer Token
    Proxy-->>Attacker: 200 OK with Bearer Token
    Attacker->>Repo: GET /artifactory/api/storage/... (Authorization: Bearer <token>)
    Repo-->>Attacker: Discloses repository indexes and sensitive build artifacts
    Note over Attacker: Forwards valid token to CVE-2026-42016<br/>Escalates token scope to Full Administrator!

3. Exploit Chain & Synergistic Weaponization

Section titled “3. Exploit Chain & Synergistic Weaponization”

While CVE-2026-42018 alone exposes repository metadata and readable artifacts, its primary threat vector is acting as the Phase 1 ignition key for full remote takeover:

  1. Phase 1 (CVE-2026-42018): The attacker queries Artifactory’s token endpoint without credentials, extracting a validly signed JWT: 
    {
      "sub": "anonymous",
      "iss": "artifactory-service",
      "scope": "applied-permissions/user",
      "exp": 1789123456
    }
  2. Phase 2 (CVE-2026-42016): The attacker invokes privileged administrative API endpoints using this token. Because the authorization validation logic in affected Artifactory versions only checks the cryptographic signature and issuer (ignoring the token’s assigned scope), Artifactory treats the anonymous token as an authenticated administrative caller, granting complete read/write access across all enterprise repositories.

4. MITRE ATT&CK Mapping

Section titled “4. MITRE ATT&CK Mapping”
TacticTechnique IDTechnique NameTechnical Manifestation
Initial AccessT1190Exploit Public-Facing ApplicationUnauthenticated HTTP request to token generation endpoints
Credential AccessT1528Steal Application Access TokenDirect acquisition of valid internal JWT tokens
DiscoveryT1082System Information DiscoveryQuerying repository structures and package indexes
Defense EvasionT1556Modify Authentication ProcessCircumventing anonymous access prohibition policies

5. Detection Opportunities & SIEM Telemetry

Section titled “5. Detection Opportunities & SIEM Telemetry”

A. Sigma Rule: Unauthenticated Token Generation Requests

Section titled “A. Sigma Rule: Unauthenticated Token Generation Requests”
title: JFrog Artifactory Anonymous Token Generation Exposure
id: b1c2d3e4-4201-4a78-9012-cve202642018
status: production
description: Detects unauthenticated HTTP requests requesting anonymous token issuance against Artifactory access service
author: Hermes Codex Cyber Threat Intelligence
date: 2026-09-11
logsource:
  category: webserver
  service: artifactory_request
detection:
  selection:
    cs_method: 'POST'
    cs_uri_stem|contains:
      - '/access/api/v1/tokens'
      - '/api/v1/tokens'
    c_user: ''
  filter_authenticated:
    cs_headers|contains: 'Authorization: Bearer'
  condition: selection and not filter_authenticated
fields:
  - c_ip
  - cs_uri_stem
  - sc_status
falsepositives:
  - Automated CI/CD integration tools performing initial health negotiations
level: high
tags:
  - attack.initial_access
  - attack.t1190
  - attack.credential_access
  - attack.t1528
  - cve.2026.42018

B. Suricata Network Detection Rule

Section titled “B. Suricata Network Detection Rule”
alert http $EXTERNAL_NET any -> $HTTP_SERVERS [8081,8082] (
  msg:"HERMES - JFrog Artifactory Anonymous Token Generation Exposure Attempt (CVE-2026-42018)";
  flow:established,to_server;
  http.method; content:"POST";
  http.uri; content:"/access/api/v1/tokens";
  content:!"Authorization:"; http_header;
  classtype:attempted-recon;
  sid:202642018;
  rev:1;
  reference:cve,2026-42018;
)

6. DFIR Forensics, Artifacts & Hunting Protocol

Section titled “6. DFIR Forensics, Artifacts & Hunting Protocol”
  1. Review Artifactory Access Service Logs ($JFROG_HOME/artifactory/var/log/access-service.log): Search for token creation events where the subject is anonymous occurring while anonymous access was administratively disabled:
    Terminal window
    grep -E 'Token issued for.*sub=anonymous' /var/opt/jfrog/artifactory/log/access-service.log
  2. Examine HTTP Request Logs ($JFROG_HOME/artifactory/var/log/artifactory-request.log): Filter for requests to token API endpoints with status 200 originating from untrusted public IP addresses.

7. Mitigation & Remediation

Section titled “7. Mitigation & Remediation”
  1. Apply Official Patches: Upgrade self-hosted JFrog Artifactory installations to version 7.111.20, 7.133.11, or higher immediately.
  2. Deploy WAF Inspection Rules: Configure edge reverse proxies (e.g., Nginx, Envoy, or HAProxy) to block unauthenticated requests targeting /access/api/v1/tokens* that do not contain valid authorization headers.
  3. Audit Token Registries: In the Artifactory administration dashboard, review active access tokens (Administration -> User Management -> Access Tokens) and revoke any unexpected or orphaned tokens generated for the anonymous user.

8. References & Official Advisories

Section titled “8. References & Official Advisories”