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CVE Vulnerability Details :
CVE-2026-8337
PUBLISHED
More InfoOfficial Page
Assigner-ConcreteCMS
Assigner Org ID-ff5b8ace-8b95-4078-9743-eac1ca5451de
View Known Exploited Vulnerability (KEV) details
Published At-21 May, 2026 | 21:13
Updated At-22 May, 2026 | 13:13
Rejected At-
▼CVE Numbering Authority (CNA)
Concrete CMS 9.5.0 and below is vulnerable to IDOR in surveys when sites are running concurrent public surveys and private surveys

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

Affected Products
Vendor
Concrete CMS
Product
Concrete CMS
Collection URL
https://github.com/concretecms/concretecms
Repo
https://github.com/concretecms/concretecms
Default Status
unaffected
Versions
Affected
  • From 5.0 through 9.5.0 (git)
Problem Types
TypeCWE IDDescription
CWECWE-639CWE-639 Authorization bypass through User-Controlled key
CWECWE-565CWE-565 Reliance on cookies without validation and integrity checking
Type: CWE
CWE ID: CWE-639
Description: CWE-639 Authorization bypass through User-Controlled key
Type: CWE
CWE ID: CWE-565
Description: CWE-565 Reliance on cookies without validation and integrity checking
Metrics
VersionBase scoreBase severityVector
4.06.3MEDIUM
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
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
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
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-31CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
CAPEC-1CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
CAPEC ID: CAPEC-31
Description: CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
CAPEC ID: CAPEC-1
Description: CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Zer0daySec (GitHub: https://github.com/Zee99y)
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
release-notes
Hyperlink: https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
Resource:
release-notes
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found