Description
yii2-starter-kit through 4.2.0 fails to validate article publication status in the attachment-download endpoint, allowing unauthenticated attackers to download files from draft articles. Attackers can enumerate sequential attachment identifiers to retrieve files from unpublished articles without authentication or authorization checks.
Published: 2026-09-30
Score: 6.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Unauthorized File Download
Action: Apply Patch
AI Analysis

Impact

The vulnerability arises from a missing validation check on the article publication status in the attachment-download endpoint of the yii2-starter-kit project. As a result, unauthenticated users can request files attached to draft articles. The primary impact is the unauthorized disclosure of confidential or unpublished content. The weakness is classified as CWE-639, an improper authorization flaw.

Affected Systems

The issue affects the yii2-starter-kit project up through version 4.2.0. Any deployments of yii2-starter-kit at or below this version are potentially impacted.

Risk and Exploitability

The CVSS score is 6.9, indicating moderate severity. The EPSS score is not available, and it is not listed in the CISA KEV catalog. Attackers can exploit this over the public network by accessing the attachment-download endpoint, enumerating sequential attachment identifiers, and downloading files from unpublished articles without authentication or authorization checks.

Generated by OpenCVE AI on September 30, 2026 at 19:58 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade to a version newer than 4.2.0 or apply the vendor‑provided security patch for yii2-starter-kit.
  • If an immediate patch is not available, restrict access to the attachment-download endpoint to authenticated users or reviewers only.
  • Implement validation to ensure the article publication status is checked before serving attachments.
  • Monitor application logs for unexpected file download activity and investigate any anomalies.

Generated by OpenCVE AI on September 30, 2026 at 19:58 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 01 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 01 Oct 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Yii2-starter-kit
Yii2-starter-kit yii2-starter-kit
Vendors & Products Yii2-starter-kit
Yii2-starter-kit yii2-starter-kit

Wed, 30 Sep 2026 17:45:00 +0000

Type Values Removed Values Added
Description yii2-starter-kit through 4.2.0 fails to validate article publication status in the attachment-download endpoint, allowing unauthenticated attackers to download files from draft articles. Attackers can enumerate sequential attachment identifiers to retrieve files from unpublished articles without authentication or authorization checks.
Title yii2-starter-kit through 4.2.0 Unauthorized File Download via attachment-download
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

Yii2-starter-kit Yii2-starter-kit
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-01T15:34:07.570Z

Reserved: 2026-09-30T16:03:01.107Z

Link: CVE-2026-103476

cve-icon Vulnrichment

Updated: 2026-10-01T15:34:02.824Z

cve-icon NVD

Status : Deferred

Published: 2026-09-30T18:18:17.973

Modified: 2026-10-01T16:17:36.317

Link: CVE-2026-103476

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-01T15:38:43Z

Weaknesses
  • CWE-639

    Authorization Bypass Through User-Controlled Key