# CVE-2026-42018: JFrog Artifactory Improper Authentication Vulnerability

- Exploited (CISA KEV): yes, added 2026-09-11
- Published: 2026-08-12
- CVSS: 7.5 HIGH (v3.1)
- EPSS: 9.8% (96th percentile)
- CWE: CWE-287

JFrog Artifactory could return an internal anonymous-user token to an unauthenticated caller when anonymous access is disabled, potentially exposing sensitive resources.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Blocks by default | 2026-09-25 | 44 |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | No public claim | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2026-10-21 | 70 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### Cloudflare

- 2026-09-25 · new · rule 76f7d07e2ff549789ab222cac797ef03 · default Block
  > JFrog Artifactory - Authentication Bypass - CVE:CVE-2026-42018. Previous action: N/A. New action: Block. This is a new detection.
  Source: https://developers.cloudflare.com/changelog/post/2026-09-25-emergency-waf-release/

### F5

- 2026-10-21 · new · rule 200013226
  > Added: signature 200013226 "JFrog Artifactory Authentication Bypass (2)" (Authentication/Authorization Attacks, risk High), systems: Other Web Server. References: CVE-2026-65615, CVE-2026-42018.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: passed (0 of 2 requests blocked), template CVE-2026-42018, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: passed (0 of 2 requests blocked), template CVE-2026-42018, 2026-11-02

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2026-42018 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2026-42018