ZeroDayAlert

CVE-2026-42018: JFrog Artifactory Improper Authentication Vulnerability

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

JFrog Artifactory Added to KEV 2026-09-11 Federal due 2026-09-25 Known ransomware use

Required action — quoted from CISA

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Where this comes from. The identifier, product, dates and required action above are copied verbatim from the CISA Known Exploited Vulnerabilities catalog. The action plan below is written by an AI agent from that record and published automatically. AssurePort has not independently tested this vulnerability and makes no claim about whether any specific system is affected.

Who is affected

JFrog Artifactory is affected by an improper authentication vulnerability. The flaw allows an unauthenticated caller to receive an internal anonymous-user token even when anonymous access has been disabled, which can lead to exposure of sensitive resources. The record does not specify affected version ranges, deployment models (self-hosted or cloud), or whether all configurations are equally vulnerable.

How to check whether this touches you

  • Inventory all instances of JFrog Artifactory you operate, noting whether each is self-hosted or cloud-managed.
  • Confirm whether anonymous access is currently disabled on each instance; if it is enabled, this vulnerability does not apply to that deployment.
  • Check whether your Artifactory instance is reachable from the internet or from untrusted networks; internal-only deployments face lower exposure.
  • Query your instance for its current version number and review JFrog's security advisories to establish whether a patch is available for your release line.
  • Test whether unauthenticated requests to your Artifactory API return a token; this is a direct signal of the vulnerability, although the absence of a token does not guarantee the absence of the flaw.

What to do

  1. Contact JFrog support or review their security bulletin to confirm the mitigation or patch applicable to your version and deployment model.
  2. If a patch is available, schedule deployment according to CISA BOD 26-04 risk-based timelines; federal systems have a due date of 2026-09-25.
  3. Until patching is complete, restrict network access to Artifactory to authenticated internal users and systems only; firewall rules or API gateway authentication policies are effective interim controls.
  4. Enable and review audit logs for all unauthenticated requests to Artifactory, paying particular attention to requests that succeeded or returned tokens.
  5. If you operate a cloud-hosted instance and JFrog has not provided a patch, follow BOD 26-04 guidance on discontinuation or alternative controls.
  6. Escalate to your security team if your instance is internet-facing and patching cannot be completed within the federal remediation window.

If you find you were exposed

Check your Artifactory audit logs for unauthenticated API requests dating back as far as your retention allows; exploitation of this flaw likely predates the 2026-09-11 disclosure date. Look for successful token issuance, repository access, or metadata queries from unauthenticated sources. If logs show exposure, assume attackers may have accessed artefacts or metadata and treat any downloaded packages as potentially compromised until you can verify their integrity. Log retention is often the limiting factor in retrospective investigation, so prioritise extending retention immediately if your current window is shorter than 90 days.

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