Concrete CMS up to 9.5.2 Conversation Attachment Upload Endpoint privileges management

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Concrete CMS up to 9.5.2. Affected by this vulnerability is an unknown functionality of the component Conversation Attachment Upload Endpoint. This manipulation causes privileges management. This vulnerability appears as CVE-2026-68533. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Concrete CMS up to 9.5.2. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the component Conversation Attachment Upload Endpoint. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at documentation.concretecms.org. This vulnerability is known as CVE-2026-68533 since 07/30/2026. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/15/2026). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Content Management System

Name

• Concrete CMS

Version

• 9.5.0
• 9.5.1
• 9.5.2

License

• open-source

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