PT-2026-22866

Name of the Vulnerable Software and Affected Versions Concrete CMS versions prior to 9.4.8 Description A stored cross-site scripting XSS issue exists in the "Legacy Form" block. An authenticated user with appropriate permissions can inject a JavaScript payload into the options of a multiple-choic...

CVE-2026-3242: Improper Neutralization of Input During Web Page Generation

In Concrete CMS below version 9.4.8, a rogue administrator can add stored XSS via the Switch Language block. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 4.8 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks M3dium for reporting...

Craft CMS security vulnerability

Craft CMS is an open-source content management system developed by Craft CMS. Versions prior to Craft CMS 5.9.0-beta.1 and 4.17.0-beta.1 contained security vulnerabilities. These vulnerabilities stemmed from a lack of permission verification during repeated entry operations, which could allow...

PT-2026-22865

In Concrete CMS below version 9.4.8, a user with permission to edit a page with element Legacy form can perform a stored XSS attack towards high-privilege accounts via the Question field. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 4.8 with...

CVE-2026-3452: Deserialization of Untrusted Data

Concrete CMS below version 9.4.8 is vulnerable to Remote Code Execution by stored PHP object injection into the Express Entry List block via the columns parameter. An authenticated administrator can store attacker-controlled serialized data in block configuration fields that are later passed to...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system designed for teams. Versions of Concrete CMS prior to 9.4.8 contained a security vulnerability. This vulnerability stemmed from a stored-cross-site scripting vulnerability in the Switch Language block, which could allow malicious...

Craft CMS security vulnerability

Craft CMS is an open-source content management system developed by Craft CMS. Versions prior to Craft CMS 4.17.0-beta.1 and 5.9.0-beta.1 contained security vulnerabilities. These vulnerabilities stemmed from the lack of validation during the creation of entries, allowing large amounts of values t...

Craft CMS security vulnerability

Craft CMS is an open-source content management system developed by Craft CMS. Versions prior to Craft CMS 5.9.0-beta.2 and 4.17.0-beta.2 contained security vulnerabilities. These vulnerabilities stemmed from the actionSendActivationEmail endpoint, which was exposed to unverified users and lacked...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system developed by Concrete CMS. Versions of Concrete CMS prior to 9.4.8 contained a security vulnerability. This vulnerability stemmed from a stored cross-site scripting vulnerability in the Question field of the Legacy form element, which could...

Concrete CMS security vulnerabilities

Concrete CMS is an open-source content management system developed by Concrete CMS. Versions of Concrete CMS prior to 9.4.8 contained a security vulnerability. This vulnerability stemmed from improper HTML encoding during the rendering of page names and content in the search block, which could le...

Craft CMS security vulnerability

Craft CMS is an open-source content management system developed by Craft CMS. Versions prior to Craft CMS 4.17.0-beta.1 and 5.9.0-beta.1 contained security vulnerabilities. These vulnerabilities stemmed from a lack of authorization checks in GraphQL directives like @parseRefs, which could allow...

Craft CMS security vulnerability

Craft CMS is an open-source content management system developed by Craft CMS. Versions prior to Craft CMS 5.9.0-beta.1 and 4.17.0-beta.1 contained security vulnerabilities. These vulnerabilities stemmed from incomplete permission lists, which could allow attackers with specific privileges to...

CVE-2026-28783: Improper Control of Generation of Code

Craft is a content management system CMS. Prior to 5.9.0-beta.1 and 4.17.0-beta.1, Craft CMS implements a blocklist to prevent potentially dangerous PHP functions from being called via Twig non-Closure arrow functions. In order to be able to successfully execute this attack, you need to either ha...

CVE-2026-28695: Improper Neutralization of Special Elements Used in a Template Engine

Craft is a content management system CMS. There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create Twig function combined with a Symfony Process gadget chain. The create Twig function exposes Craft::createObject, which allows instantiation of...

CVE-2026-3241: Improper Neutralization of Input During Web Page Generation

In Concrete CMS below version 9.4.8, a stored cross-site scripting XSS vulnerability exists in the "Legacy Form" block. An authenticated user with permissions to create or edit forms e.g., a rogue administrator can inject a persistent JavaScript payload into the options of a multiple-choice...

CVE-2026-2994: Cross-Site Request Forgery (CSRF)

Concrete CMS below version 9.4.8 is subject to CSRF by a Rogue Administrator using the Anti-Spam Allowlist Group Configuration via groupid parameter which can leads to a security bypass since changes are saved prior to checking the CSRF token. The Concrete CMS security team gave this vulnerabilit...

CVE-2026-3244: Improper Neutralization of Input During Web Page Generation

In Concrete CMS below version 9.4.8, A stored cross-site scripting XSS vulnerability exists in the search block where page names and content are rendered without proper HTML encoding in search results. This allows authenticated, rogue administrators to inject malicious JavaScript through page nam...

PT-2026-22864

Concrete CMS below version 9.4.8 is subject to CSRF by a Rogue Administrator using the Anti-Spam Allowlist Group Configuration via group id parameter which can leads to a security bypass since changes are saved prior to checking the CSRF token. The Concrete CMS security team gave this vulnerabili...

GHSA-QC86-Q28F-GGWW Craft CMS has potential authenticated Remote Code Execution via Twig SSTI

For this to work, the attacker must have administrator access to the Craft Control Panel, and allowAdminChanges must be enabled, which is against Craft CMS' recommendations for any non-dev environment. https://craftcms.com/knowledge-base/securing-craftset-allowAdminChanges-to-false-in-production...

Craft CMS has potential authenticated Remote Code Execution via Twig SSTI

For this to work, the attacker must have administrator access to the Craft Control Panel, and allowAdminChanges must be enabled, which is against Craft CMS' recommendations for any non-dev environment. https://craftcms.com/knowledge-base/securing-craftset-allowAdminChanges-to-false-in-production...