PT-2026-42565 · Unknown · Concrete Cms

Zer0Daysec · CVE-2026-8337 · Published 2026-05-21 · Updated 2026-05-22

Positive Technologies (AI Summary)

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Concrete CMS versions 9.5.0 and earlier

Description An Insecure Direct Object Reference (IDOR) exists in the surveys feature. This occurs when a site is configured with both public and private surveys. An unauthenticated attacker can vote in a restricted survey by submitting a restricted optionID through the public survey endpoint.

Recommendations Update to a version later than 9.5.0.

Exploit

Fix

IDOR

Weakness Enumeration

CWE-639

CWE-565

Related Identifiers

CVE-2026-8337

GHSA-8C7C-H7PX-267G

Affected Products

Concrete Cms

References · 9

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8337.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-8337 · Security Note
• https://osv.dev/vulnerability/CVE-2026-8337 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-8c7c-h7px-267g · Vendor Advisory
• https://github.com/concretecms/concretecms · Note
• https://twitter.com/infoflowcloud/status/2057785089564594192 · Twitter Post
• https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes · Note
• https://t.me/CVEtracker/54562 · Telegram Post
• https://twitter.com/CVEnew/status/2057783216036057176 · Twitter Post