EUVD-2026-79144
GHSA-2vf2-cvcp-v89w
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from Vendor (ConcreteCMS) · only source for this CVE.
CVSS VectorVendor: ConcreteCMS
Lifecycle Timeline
1DescriptionCVE.org
Concrete CMS below 9.5.3 conversation attachment uploaded endpoint imported files into the file manager before evaluating the "Add Message Attachments" permission, which was only checked after the file had been stored. A user denied that permission, or an unauthenticated visitor on a guest-posting configuration, could import approved files of allowed types into the file manager. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.
AnalysisAI
Concrete CMS versions below 9.5.3 import files uploaded through the conversation attachment endpoint into the site's file manager before verifying the 'Add Message Attachments' permission, so the authorization check happens only after the file has already been stored. A low-privileged authenticated user who has been explicitly denied that permission — or an unauthenticated visitor on a site configured to allow guest posting — can therefore inject files of allowed types into the file manager, altering stored content or consuming storage. …
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External POC / Exploit Code
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