CVE-2026-81925

Concrete CMS before 9.5.3 improperly neutralized a user-supplied custom date format when rendering conversation messages, resulting in reflected cross-site scripting. An attacker could execute arbitrary JavaScript in the browser of a user who was tricked into submitting a crafted POST request to...

EUVD-2026-79939

Concrete CMS before 9.5.3 improperly neutralized a user-supplied custom date format when rendering conversation messages, resulting in reflected cross-site scripting. An attacker could execute arbitrary JavaScript in the browser of a user who was tricked into submitting a crafted POST request to...

PT-2026-92515

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.3 Description Improper neutralization of a user-supplied custom date format when rendering conversation messages leads to reflected cross-site scripting XSS, a technique where malicious scripts are injected...

CVE-2026-8238

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/messagepage' endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

CVE-2026-8237

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The /ccm/frontend/conversations/messagedetail endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

Missing Authorization

Overview concrete5/concrete5 is a concrete5 open source CMS. Affected versions of this package are vulnerable to Missing Authorization via the /ccm/frontend/conversations/messagedetail endpoint. An attacker can access the full content of any conversation message, including those from restricted...

GHSA-XPGC-7VC2-8725 Concrete CMS is vulnerable to IDOR

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The /ccm/frontend/conversations/messagedetail endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

GHSA-QV3X-MFFX-9GW8 Concrete CMS is vulnerable to IDOR

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/messagepage' endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

Missing Authorization

Overview concrete5/concrete5 is a concrete5 open source CMS. Affected versions of this package are vulnerable to Missing Authorization via the /ccm/frontend/conversations/messagepage endpoint. An attacker can access the full content of any conversation message, including those from restricted...

CVE-2026-8238 Concrete CMS 9.5.0 and below is vulnerable to IDOR in '/ccm/frontend/conversations/message_page' allowing unauthenticated read of any conversation message

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/messagepage' endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

CVE-2026-8238 Concrete CMS 9.5.0 and below is vulnerable to IDOR in '/ccm/frontend/conversations/message_page' allowing unauthenticated read of any conversation message

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The '/ccm/frontend/conversations/messagepage' endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

CVE-2026-8237 Concrete CMS 9.5.0 and below is vulnerable to IDOR in the`/ccm/frontend/conversations/message_detail` endpoint

Concrete CMS 9.5.0 and below is vulnerable to IDOR. The /ccm/frontend/conversations/messagedetail endpoint returns the full content of any conversation message. An unauthenticated attacker can enumerate all conversation messages, including messages from restricted pages, member-only areas, and th...

PT-2026-42560

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.5.1 Description An Insecure Direct Object Reference IDOR exists where the '/ccm/frontend/conversations/message page' endpoint returns the full content of any conversation message. This allows an unauthenticated...

Cross-Site Scripting (Reflected XSS)

concrete5/concrete5 is vulnerable to Cross-Site Scripting XSS. The vulnerability is due to unsanitized input in the Conversation Messages Dashboard Page, which allows an attacker to steal session cookies or tokens, deface web content, redirect victims to malicious sites, or execute unauthorized...

GHSA-4PCG-PJP5-3MC6 Concrete CMS vulnerable to Reflected Cross-Site Scripting (XSS) in Conversation Messages Dashboard Page

Concrete CMS 9 to 9.4.2 and versions below 8.5.21 are vulnerable to Reflected Cross-Site Scripting XSS in the Conversation Messages Dashboard Page. Unsanitized input could cause theft of session cookies or tokens, defacement of web content, redirection to malicious sites, and if victim is an admi...

Cross-site Scripting (XSS)

Overview concrete5/concrete5 is a concrete5 open source CMS. Affected versions of this package are vulnerable to Cross-site Scripting XSS due to improper input sanitization in the Conversation Messages Dashboard page. An attacker can execute arbitrary scripts in the context of a user's browser by...

CVE-2025-8571 Concrete CMS 9 through 9.4.2 and below 8.5.21 is vulnerable to Reflected Cross-Site Scripting (XSS) in Conversation Messages Dashboard Page

Concrete CMS 9 to 9.4.2 and versions below 8.5.21 are vulnerable to Reflected Cross-Site Scripting XSS in the Conversation Messages Dashboard Page. Unsanitized input could cause theft of session cookies or tokens, defacement of web content, redirection to malicious sites, and if victim is an admi...

CVE-2025-8571: Improper Input Validation

Concrete CMS 9 to 9.4.2 and versions below 8.5.21 are vulnerable to Reflected Cross-Site Scripting XSS in the Conversation Messages Dashboard Page. Unsanitized input could cause theft of session cookies or tokens, defacement of web content, redirection to malicious sites, and if victim is an admi...