CVE-2026-3244 Concrete CMS below version 9.4.8 is vulnerable to Stored XSS in Search Results via Page Names
Authenticated administrators can inject malicious JavaScript via page names, leading to stored XSS in search results for other users.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-3244?
CVE-2026-3244 is a medium-severity cross-site scripting vulnerability in Concretecms Concrete Cms, published on 4 Mar 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
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 names that executes when users search for and view those pages in search results. 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 zolpak for reporting
Weakness: CWE-79
Which versions are affected by CVE-2026-3244?
2 open source packages ship an affected version, including concrete5/concrete5. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
concrete5/concrete5 Packagist | All versions | 9.4.8 |
concrete5/concrete5 Packagist | All versions | 9.4.8 |
Products include Concretecms Concrete Cms.
How do I fix CVE-2026-3244?
Upgrade concrete5/concrete5 to 9.4.8 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-3244 being exploited?
There is no known exploitation of CVE-2026-3244 in the wild and no public exploit code.
Other vulnerabilities in Concretecms Concrete Cms
- CVE-2023-48648 Concrete CMS allows unauthorized access because directories can be created with insecure permissions
- CVE-2022-21829 Code injection in concrete CMS
- CVE-2021-22958 Server-Side Request Forgery vulnerability in concrete5
- CVE-2021-40098 Path traversal in n/a
- CVE-2026-8134 Concrete CMS Vulnerable to Relative Path Traversal
Sources
Also known as GHSA-mm5f-5rqw-574f.