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Medium severity · published May 21, 2026
CVE-2026-7881
Concrete CMS 9.5.0 and below is vulnerable to IDOR in the Express Entry Detail block
4.3
CVSS
0.2%
EPSS
No
On KEV
Description
Concrete CMS 9.5.0 and below is subject to Insecure Direct Object Reference (IDOR) in the Express Entry Detail block via the exEntryID parameter. This IDOR leads to unauthorized access to all Express form submissions. 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 Tristan Madani for reporting.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
Concrete CMS · Concrete CMS
5.0 before 9.5.0 · source: vendor, NVD
Affected product
CC
Concrete CMS
Concrete CMS
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-7881
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-7881
Release Notes
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
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