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CVE-2026-7882

Concrete CMS 9.5.0 and below is vulnerable to CSRF via the DeleteFile controller

Published: May 21, 2026Updated: May 26, 2026 Sources: CVE List NVDCWE-352
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.1%
Top 98.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

Concrete CMS 9.5.0 and below is vulnerable to unauthorized file deletion due to an Inverted CSRF token check in the DeleteFile controller. The code throws an error when the token IS valid and proceeds with file deletion when the token is invalid or missing. This effectively disables CSRF protection for the file deletion endpoint, allowing cross-site request forgery attacks against users who have permission to edit conversation messages. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with a vector of CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Tristan Mandani for reporting.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-352

Affected Products

Concrete CMSConcrete CMS
On-premCMS Plugin
Web & CMS Plugins / cms-core
concrete cmsconcretecmsWeb & CMS Plugins
concrete cmscommercialWeb & CMS Pluginsaka concrete5
concretecmsoss-projectWeb & CMS Pluginsaka concrete cms, concrete cms

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Initial Access
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References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
documentation.concretecms.org

Timeline

Published
May 21, 2026
Last Updated
May 26, 2026

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