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Findings

CVE-2026-8237

Concrete CMS 9.5.0 and below is vulnerable to IDOR.

Published May 21, 2026 · updated Jul 23, 2026 · concretecms concrete cms

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and the moderation queue. File attachments with download URLs are also exposed. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Eldudareeno for reporting.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 21, 2026 · NIST NVD

    Detected

    Concrete CMS 9.5.0 and below is vulnerable to IDOR. The endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and the moderation queue. File attachments with download URLs are also exposed. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 sco

  2. Jul 23, 2026 · NIST NVD

    Updated

    Concrete CMS 9.5.0 and below is vulnerable to IDOR. The endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and the moderation queue. File attachments with download URLs are also exposed. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 sco

Affected

  • cpe concretecms/concrete cmsversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-8237

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-8237

    Concrete CMS 9.5.0 and below is vulnerable to IDOR. The endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, membe

    nvd.nist.gov

References