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VULNERABILITIES

CVE-2026-8337 Details

Description

Concrete CMS 9.5.0 and below is vulnerable to IDOR in surveys. To be vulnerable, a site would have to be configured in such a way that both public and private surveys are present on the site. An unauthenticated attacker can vote in the restricted survey by submitting the restricted optionID through the public survey’s endpoint. 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:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks  Zer0daySec https://github.com/Zee99y  for reporting

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes ConcreteCMSRelease Notes

Weakness Enumeration

CWE-IDCWE NameSource
CWE-565Reliance on Cookies without Validation and Integrity CheckingConcreteCMS
CWE-639Authorization Bypass Through User-Controlled KeyConcreteCMS

Affected Products

ProductVersions
concretecms concrete cms
< 9.5.1

CPE

  • cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-8337
NVD Published Date:
May 21, 2026
NVD Last Modified:
Jul 23, 2026
Source:
ConcreteCMS
CVE-2026-8337 Details - Not Deferred